Chapter 4 - Exercises

#103

1 Like

#104

Can someone explain to me the diference between the reverse array and in-place reverse array. thanks :blush:

1 Like

#105
Exercise HTML + JavaScript Code
<!DOCTYPE html>
<html>
  <head>
    <title>Exercise!</title>
  </head>
  <body>
    <script type="text/javascript">
        function range(start, end, step = 1) {
          var arr = [];
          var is_not_end = function(a) {
            return (start <= end && a <= end) ||
                  (start > end && a >= end);
          }
          for(let i = start; is_not_end(i); i += step)
            arr.push(i);
          return arr;
        }
        function sum(array) {
          var _sum = 0;
          for(i in array){
            _sum += parseInt(array[i]);
          }
          return _sum;
        }
        function reverseArray(array) {
          var new_array = [];
          for (i in array) {
            new_array.push(array[array.length - i - 1]);
          }
          return new_array;
        }
        function reverseArrayInPlace(array) {
          var tmp;
          for (var i = 0; i < Math.floor(array.length / 2); i++) {
            tmp = array[i];
            array[i] = array[array.length - i - 1];
            array[array.length - i - 1] = tmp;
          }
          return array;
        }
        console.log(sum(range(1,10)));
        console.log(range(1, 10, 2));
        console.log(range(5, 2, -1));
        console.log(reverseArray(range(1,10)));
        console.log(reverseArrayInPlace(range(1,10)));
    </script>
  </body>
</html>
1 Like

#106

SUM OF THE RANGE

For this exercise I wanted to do an instance that combines both ASCENDING and DESCENDING alternatives, and evaluates all possible – and valid – start/end/step combinations.

I wanted to do it all within a working HTML page that requests all 3 inputs from the user,
and with just a bit of CSS to style the input boxes. Hopefully, someone will find it helpful.

Click here to see the code within the context of an HTML page...
<html>
     <head>
      <title>Chapter 4 - EXERCISES Parts 1-4</title>
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  </head>
  <body>
<h1>Chapter 4 - EXERCISES</h1>
  <h2>The Sum of a Range, Parts 1-4 combined</h2>
  <h4>Make it work with either ascending or descending numbers and either a positive or negative step.</h4>
  <h4> <strong>NOTE:</strong>  JS booleans don't work well when evaluating negative numbers, 
          so I created 5 valid instances that use subtraction (START - END) instead of GREATER THAN
          to evaluate which of these 2 values is greater. It's a roundabout process, but it works.</h4>

  <input id= "rangeStart" type="number" placeholder=" Array START" style="font-size:1em; padding:10px; margin:10px; width:350px;"//>
  <br />
  <input id= "rangeEnd" type="number" placeholder="Array END" style="font-size:1em; padding:10px; margin:10px; width:350px;"//>
  <br />
  <p> Write STEP number, if different than 1:</p>
  <input id= "rangeStep" type="number" value = "1" placeholder="Array STEP (if different than '1')" style="font-size:1em; padding:10px; margin:10px; width:350px;"//>

  <div id= "rangeButton">
      <button  type="submit" style="font-size:1em; padding:10px; margin:10px; width:350px;">Create Array and Range Sum</button>
  </div>
  <div id= "showStep"><p> <p> </div>
  <br />
  <div id= "showArray"><p> <p> </div>
  <br />
  <div id= "showRangeSum"><p> <p></div>
  <br />

<script>
 // FUNCTION TO EVALUATE STEP NUMBER

      function verifyNumbers (start, end, step) {
         var firstNumber = start;
         var lastNumber = end;
         var jumpNumber = step;

         // INSTANCE A: 2 negatives (or START = 0), DESCENDING
         if (start<=0 && end<0 && start-end>end && step <=-1) {
              console.log("Success! (A: 2 negatives, DESCENDING)");
              rangeDown(firstNumber,lastNumber,jumpNumber);
             sumDown(firstNumber,lastNumber,jumpNumber);
         }
         // INSTANCE B: 2 negatives (or END = 0), ASCENDING
         else if (start<0 && end<=0  && start-end<end && step >=1) {
                    console.log("Success! (B: 2 negatives, ASCENDING)");
                    rangeUp(firstNumber,lastNumber,jumpNumber);
                    sumUp(firstNumber,lastNumber,jumpNumber);
          }
          // INSTANCE C: 2 positives (or START = 0), DESCENDING
          else if (start>=0 && end>0 && start-end<start && step <=-1){
                    console.log("Success! (C: 2 positives, DESCENDING)");
                    rangeDown(firstNumber,lastNumber,jumpNumber);
                    sumDown(firstNumber,lastNumber,jumpNumber);
          }
          // INSTANCE D: END is POSITIVE, START either, but end > start), ASCENDING
          else if (start-end<start && step >=1) {
                   console.log("Success! (D: END is positive, START is either, ASCENDING ");
                   rangeUp(firstNumber,lastNumber,jumpNumber);
                  sumUp(firstNumber,lastNumber,jumpNumber);
           }
           // INSTANCE E: END is NEGATIVE, START is positive, DESCENDING
           else if (start-end >start && step <=-1) {
                     console.log("Success! (E: END is negative, START is positive, DESCENDING)");
                     rangeDown(firstNumber,lastNumber,jumpNumber);
                     sumDown(firstNumber,lastNumber,jumpNumber);
            }
            // INSTANCE F: else... ALERT TO REVISE NUMBER COMBO
            else
            alert ("Make sure your 3 numbers given make sense to compute! Try again!");

            // BELOW curly brace closes verifyNumbers FUNCTION
      }

     /* NOW THAT THE VALIDATION WORKS CORRECTLY, I'll create below 2 sets of functions:
        1 ASCENDING "rangeUp" and "sumUp"), AND
         "rangeDown" and "sumDown"
      */

      // ASCENDING FUNCTIONS...

     function rangeUp(start,end,step){
           var newArray = [start];
           var startNumber = parseInt(start);
           var endNumber = parseInt(end);
           var stepNumber = parseInt(step);
           document.getElementById("showStep").innerHTML = "<br />The CHOSEN step is: " + stepNumber;

           for (counter = startNumber + stepNumber; counter <= endNumber; counter += stepNumber){
                  var nextNumber = counter ;
                  newArray.push(" " + nextNumber)
            };
           document.getElementById("showArray").innerHTML = "<br />The new array is: " + newArray;
     }
     function sumUp(start,end,step){
            var total = 0;
            var startNumber = parseInt(start);
            var stepNumber = parseInt(step);
            var endNumber = parseInt(end);
            for (var counter=startNumber; counter<=endNumber ; counter += stepNumber){
                  var total = total + parseInt(counter);
            };
            document.getElementById("showRangeSum").innerHTML = "<br />The sum of the range is: " + total ;
     };

     // DESCENDING FUNCTIONS...

    function rangeDown(start,end,step){
           var newArray = [start];
           var startNumber = parseInt(start);
           var endNumber = parseInt(end);
           var stepNumber = parseInt(step);
           document.getElementById("showStep").innerHTML = "<br />The CHOSEN step is: " + stepNumber;

           for (counter = startNumber + stepNumber; counter >= endNumber; counter += stepNumber){
                    var nextNumber = counter ;
                    newArray.push(" " + nextNumber)
             };
            document.getElementById("showArray").innerHTML = "<br />The new array is: " + newArray;
      }
      function sumDown(start,end,step){
            var total = 0;
            var startNumber = parseInt(start);
            var stepNumber = parseInt(step);
            var endNumber = parseInt(end);
            for (var counter=startNumber; counter>=endNumber ; counter += stepNumber){
                  var total = total + parseInt(counter);
             };
             document.getElementById("showRangeSum").innerHTML = "<br />The sum of the range is: " + total ;
      };

  // END OF ALL FUNCTIONS
  //  Now, the jQuery that waits for the click, saves written values and calls the verification function.

        $("#rangeButton").click(function(){
              var firstNumber = $("#rangeStart").val();
              var lastNumber = $("#rangeEnd").val();
              var jumpNumber = $("#rangeStep").val();
              verifyNumbers(firstNumber, lastNumber, jumpNumber);
          });
    </script>
</body>

REVERSING AN ARRAY - Part 1: Creating a new array.

Write a function, reverseArray that takes an array as an argument and produces
a NEW array that has the same elements in the inverse order.

function reverseArray(initialArray){
    var newArray = [];
    var lastElement = initialArray[initialArray.length - 1];
      for (counter = initialArray.length - 1; counter>=0; counter--){
          toReverse = initialArray[counter];
          newArray.push(" " + toReverse);
       };
 }
 reverseArray(["apples", "oranges", "mangos", "bananas" , "avocados"]);

REVERSING AN ARRAY - Part 2: Using the same array.

Without using the standard reverse method, modify the array given as argument in order to reverse its elements.

function reverseArrayInPlace(alwaysArray){
     var numberOfItems = alwaysArray.length;
     for (counter = 0 ; counter<= ( numberOfItems-1 ) ; counter ++){
          var lastItem = alwaysArray[numberOfItems-1];
          alwaysArray.splice (counter, 0, lastItem);
          alwaysArray.pop()
       };
}
reverseArrayInPlace(["apples", "oranges", "mangos", "bananas", "avocados"]);
3 Likes

#107

Hi Basem,

For the first exercise, reverse array, you create a NEW array with the reversed items. The original array stays intact. For the reverse-in-place, the challenge is to move the items within the same array, without using a second array. If needed, see how I did it below, below @jozanna’s comment.

2 Likes

#108

Understood thank you so much :smiley:

1 Like

#109

I think there are 4 exercises in chapter 4…? Anyone ?

1 Like

#110

Sum of a range excercise

$(document).ready(function(){

("#button").click(function(){ let input1 = parseInt((("#textInput1").val()));
let input2 = parseInt((("#textInput2").val())); let input3 = parseInt((("#textInput3").val()));

if(input3==0){
  alert("0 is an invalid step");
}

function sum(numbers){
  let result = 0;
  for(i=0; i<numbers.length; i++){
    result = numbers[i] + result;
  }
  return result;
}


function range(lowNum,highNum,step){
  let myArray = [];
    if(step>=1){
      for(i=lowNum; i<=highNum; i+=input3){
        myArray.push(i);
      }
    return myArray;
    }

    else{
      for(i=lowNum; i>=highNum; i+=input3){
        myArray.push(i);
      }
    return myArray;
    }
}

console.log(sum(range(input1,input2,input3)));

});

});

Reverse Array Excercise

$("#button").click(function(){

input1 = parseInt((("#textInput1").val())); input2 = parseInt((("#textInput2").val()));
input3 = parseInt((("#textInput3").val())); input4 = parseInt((("#textInput4").val()));
input5 = parseInt(($("#textInput5").val()));

let myArray = [input1, input2, input3, input4, input5];
let arrayInPlace = [input1, input2, input3, input4, input5];

function reverseArray(funcArray){
let newArray =[];
let loopCounter = funcArray.length;
for(i=0; i<loopCounter; i++){
newArray.push(funcArray.pop());
}
return newArray;
}

document.write("Array reversed with first function: " + reverseArray(myArray) + β€œ

”);

function reverseArrayInPlace(internalArray){
let internalArray2 = [];
let loopCounter2 = internalArray.length;
for(i=0; i<loopCounter2; i++){
internalArray2.push(internalArray.pop());
}
arrayInPlace = internalArray2;
}

reverseArrayInPlace(arrayInPlace);
document.write("Array reversed with second function: " + arrayInPlace + β€œ

”);

});

1 Like

#111

Yes, Sanni, there are 4 exercises in the book but Ivan requested only the first 2, at least for now.

2 Likes

#112
**Sum of a Range**
        <!DOCTYPE html>
        <htmL>
          <head>
            <title>Sum Of A Range</title>
              <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
            </head>
              <body>
                <h1>Sum of a range of numbers</h1>
                  <ol id="rangeOfNumbers"></ol>
              <script>
                startNumber =1;
                endNumber=10;
                var i;
                var numberArray=[];
                function buildArray(startNumber,endNumber){
                  for (i=startNumber; i<=endNumber;i++) {
                    numberArray.push(i);}};
                buildArray(startNumber,endNumber);
                var total =0;
                var list =$("#rangeOfNumbers");
                $.each(numberArray,function(index,value){
                  $("<li/>").text(value).appendTo(list);
                  currentValue=parseInt(value);
                  total=addNumbers(total,currentValue);
                  });

              function addNumbers(runningTotal,arrayValue){
                return runningTotal+parseInt(arrayValue);
              };

            console.log(numberArray);
            console.log(total);
                </script>
        </body>
        </html>

**Sum of a Range Reversed**
    <!DOCTYPE html>
    <htmL>
      <head> <title>Sum Of A Range</title> <script
      src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
      </head> <body> <h1>Sum of a range of numbers</h1> <ol
      id="rangeOfNumbers"></ol>
      <script>
      startNumber =1;
      endNumber=10;
      stepNumber=1;
      var i;
      var numberArray=[];

      function buildArray(startNumber,endNumber,stepNumber){
        if (startNumber<endNumber) {
          for (i=startNumber;i<=endNumber;i=i+stepNumber) {
           numberArray.push(i);}
         } else {
           for (i=startNumber;i>=endNumber;i=i+stepNumber) {
                   numberArray.push(i);}
                 };
               }
      buildArray(startNumber,endNumber,stepNumber);

      var total =0;
      var list =$("#rangeOfNumbers");
      $.each(numberArray,function(index,value){
              $("<li/>").text(value).appendTo(list);
              currentValue=parseInt(value);
              total=addNumbers(total,currentValue);
             });

          function addNumbers(runningTotal,arrayValue){
            return runningTotal+parseInt(arrayValue);
          };

        console.log(numberArray);
        console.log(total);
      </script></body> </html>

**Reversing an Array**
1 Like

#113

The sum of a range

console.log(range(1, 10));
// β†’ [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
console.log(range(5, 2, -1));
// β†’ [5, 4, 3, 2]
console.log(sum(range(1, 10)));
// β†’ 55

Reversing an array
console.log(reverseArray([β€œA”, β€œB”, β€œC”]));
// β†’ [β€œC”, β€œB”, β€œA”];
let arrayValue = [1, 2, 3, 4, 5];
reverseArrayInPlace(arrayValue);
console.log(arrayValue);
// β†’ [5, 4, 3, 2, 1]

1 Like

#114

Sum Of Range

function range(start, end, step = start < end? 1:-1){

//ternary object is simeple if else statment: if(start<end){step =1;} else {step =-1;}



let array =[];

//make an empty array for yourself first in order to fill up your numbers later on.

if (step >0){

for (let i = start; i <= end ; i+= step)array.push(i);

//i <=end which shows positive number and array.push to push in numbers in [] each time when i iterates.

}else{

for (let i = start; i >= end ; i+= step)array.push(i);

//i >= end shows (-numbers) and array.push to push in numbers in [] each time when i iterates.

}

return array;

// to show the array which you ask in console.

}

function sum(array){

//a function calls array to be involved.

let total = 0;

//to start with 0 so the next number won't be adding other number to itself.

for (value of array){

//this is saying what's inside the array [1,2,3,]

total+=value;

//total 0+1+2+3

}

return total;

//to show your result which you ask in console.

}

console.log(range(10,22));

console.log(range(-1,-25));

console.log(sum(range(1,10)));

Reverse Array

function reverseArrayInPlace(array){
  for(let i=0; i < Math.floor(array.length/2); i++){
    let old = array[i];
    array[i] = array[array.length -1 -i];
    array[array.length -1 -i] = old;
  }
  return array;
}

let arrayValue = ["a","b","c","d","e"];
reverseArrayInPlace(arrayValue);
console.log(arrayValue);
//(5) ["e", "d", "c", "b", "a"]
0:"e"
1:"d"
2:"c"
3:"b"
4:"a"
length:5

:tada::tada: :tada:
:tada: :tada:
:tada::

1 Like

#115

//Sum of range
let Sum = function (a,b) {
let SumResult = 0;
let result = range1(a,b);

for (var i = 0 ; i <= result.length - 1 ; i++) {
SumResult = SumResult + result[i];
}
return SumResult;

}
console.log(Sum(1,10));

// advanced sum of range with step
let range2 = function (a,b,c){
if (a>b && c == null ) { //test if the increment Β© must be positive or negative and check if c has a value
c = -1; // if both condition met, c = -1
}
else if (a<b && c == null) { //test if the increment Β© must be positive or negative and check if c has a value
c=1; // if both condition met, c = -1
}
let result = []; //Creates an empty array
if (Math.signΒ© == 1){ //test if c is positive

    for (var i = a ; i <= b ; i = i + c){ //loop to sum all intries in the array
    result.push(i);
    }
}
else { //if c is negative

    for (var i = a ; i >= b ; i = i + c) { //loop to sum all intries in the array
    result.push(i);
    }
}
return result; //return the sum

}
console.log(range2(1,10,2));
console.log(range2(5,2,-1));

//REVERSING ARRAY
let ReverseArray = function (Array1){
let Array2 = []; //Creates an empty array
for ( var i = Array1.length -1 ; i>= 0 ; i–){ //loop backward in array1
Array2.push(Array1[i]); //push the value to the new array2
}
return Array2

}
console.log(ReverseArray([β€œA”,β€œB”,β€œC”]));

//Reverse array in place

let ReverseArrayInPlace = function (Array1){
let StorageValue = 0
for ( var i = 0 ; i < Math.floor(Array1.length / 2) ; i++ ){
StorageValue = Array1[i];
Array1[i] = Array1[Array1.length -1 -i];
Array1[Array1.length -1 -i] = StorageValue;
}
return Array1
}
console.log(ReverseArrayInPlace([1,2,3,4,5]));

1 Like

#116

Sum of Array:

  var arrayReturn = [];

  function range(x,y,z) {
    arrayReturn = [];
    if (x>y && z<0) {
      while (x>=y) {
        arrayReturn.push(x);
        x=x+z;
      }
    }
    else if(x<y && z>0) {
      while (x<=y) {
        arrayReturn.push(x);
        x=x+z;
      }
    }
    else {
      console.log("No valid input");
    }
  }


  function sum(){
    var sumArray = 0;
    $.each(arrayReturn,function(index,value){
      sumArray=(sumArray+value);
    });
    return sumArray;
  }

  console.log("Summe 1: "+sum(range(2,9,-2)));
  console.log("Summe 2: "+sum(range(9,2,-2)));
  console.log("Summe 3: "+sum(range(2,9,2)));
  console.log("Summe 4: "+sum(range(1,10,1)));
  console.log("Summe 5: "+sum(range(7,2,-3)));

Reverse Array:

  var newArray =[];
  var arrayToReverse = [2,4,6,8];

  function reverseArray(arrayGiven) {
    for (counter=(arrayGiven.length-1); counter>=0; counter--){
      newArray.push(arrayGiven[counter]);
    }
  }

  function reverseArrayInPlace() {
    var tempArray = [];
    for (counter=(arrayToReverse.length-1); counter>=0; counter--){
      tempArray.push(arrayToReverse[counter]);
    }
    arrayToReverse = [];
    for (counter=0; counter<tempArray.length; counter++){
      arrayToReverse.push(tempArray[counter]);
    }
  }

  reverseArray([2, 3, 4, 5, 6, 7, 8, 9]);
  console.log("New array in reversed order: " + newArray);

  reverseArrayInPlace(arrayToReverse);
  console.log("Original array reversed: " + arrayToReverse);
1 Like

#117
  1. Function to return range from start to end with given step size as β€œstep”.

    function range(start,end, step) {
    var myArr = [];
    if (start < end) {
    for (var k=start; k<=end; k+=step) {
    myArr.push(k);
    }
    return myArr;
    } else {
    for (var k=start; k>=end; k+=step) {
    myArr.push(k);
    }
    return myArr;
    }

}

  1. Function to sum the array

    function sumArr(arr) {
    var total = 0;
    for (var i in arr) {
    total += arr[i];
    }
    return total;
    }

  2. Function to reverse an array

    function reverseArray(arr) {
    var newArr = [];
    for (var k=(arr.length); k>=0; k–) {
    newArr.push(arr[k]);
    }
    return newArr;
    }

1 Like

#118

Thanks for the detailed explanation! it helped me a lot!

1 Like

#119

My answers to Chapter 4 Exersises

var myArray = [];
var sum = 0;

function ranges(num1, num2, step) {
if (step === undefined || step == null) {
for (var num1; num1 <= num2; num1++) {
myArray.push(num1);
};
console.log(myArray);
} else if (step > 0) {
for (var num1; num1 <= num2; num1+=step) {
myArray.push(num1);
};
console.log(myArray);
} else if (step < 0) {
for (var num1; num1 >= num2; num1+=step) {
myArray.push(num1);
};
console.log(myArray);
}
};

console.log(myArray);

ranges(1,10,1);

for (var i= 0; i<myArray.length; i++){
sum+=myArray[i];
console.log(sum);
}

//Reverse Arrays

/**
function reverseArray(myArray){

reverseA=[];
for (a =myArray.length - 1; a>=0; a–){
reverseA.push(myArray[a])
};
return(reverseA);
};

document.write(reverseArray(myArray));
**/

//Reverse In Place

/**
function reverseArrayInPlace(myArray){
for (let i = 0; i < Math.floor(myArray.length / 2); i++) {
let old = myArray[i];
myArray[i] = myArray[myArray.length - 1 - i];
myArray[myArray.length - 1 - i] = old;
}
return myArray;
};

document.write(reverseArrayInPlace(myArray));
**/

I dont know which is more useful or faster, but the first option seems simpler to me, as there are less lines of code. I dont know if its faster to write a new array or to do all the math in order to come up with the Reverse In Place Array.

1 Like

#120

Hello @ivan and dear community,

EXERCISES CHAPTER 4 :computer::books:

:round_pushpin: THE SUM OF A RANGE

:sparkles: Function β€œrange()”

function range(start, end) {
    if (start < end) {
        var myArray = [];
        for (var i = 0; i <= (end - start); i++) {
            myArray[i] = start + i;
        }
    } else {
        alert("The first value must be lower than the second value!");
    }
    return myArray;
}

:sparkles: Function β€œsum()”

function sum(iArray) {
    let iResult = 0;
    for (var i = 0; i < iArray.length; i++) {
        iResult += iArray[i];
    }
    return iResult;
}

Usage of the functions β€œrange()” and β€œsum()”:
console.log(sum(range(1, 10)));

:sparkles: Bonus

<HEAD>
    <Script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js" ></SCRIPT>
</HEAD>
<BODY>
    <SCRIPT>

        var start = 1;
        var end = 10;
        var inc = -2;
        console.log(start + " to " + end + " by " + inc + " = " + sum(range(start, end, inc)));

        function range(start, end, increment) {

            var myArray = [];

            if (increment === undefined) {
                increment = 1;
            }

            if (start < end) {
                // Invert the increment        
                if (increment < 0) {
                    increment *= -1;
                }
                for (var i = 0; i <= (end - start); i++) {
                    if (i * increment <= end - start) {
                        myArray[i] = start + i * increment;
                        console.log(start + i * increment);
                    }
                }
            } else {
                if(increment < 0) {
                    increment *= -1;
                }
                for (var i = 0; i <= (start - end); i++) {
                    if (i * increment <= start - end) {
                        myArray[i] = start - i * increment;
                        console.log(start - i * increment);
                    }
                }
            }
            return myArray;
        }

        function sum(iArray) {
            let iResult = 0;
            for (var i = 0; i < iArray.length; i++) {
                iResult += iArray[i];
            }
            return iResult;
        }
    </SCRIPT>
</BODY>

:round_pushpin: REVERSING AN ARRAY

:sparkles: Function β€œreverseArray()” (system-embedded solution)

<HEAD>
    <Script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js" ></SCRIPT>
</HEAD>
<BODY>
    <SCRIPT>
        function iReverseArray(inputArray) {
            return inputArray.reverse();
        }

        let myArray = ["Ivan", "On", "Tech"];
        console.log(iReverseArray(myArray));
    </SCRIPT>
</BODY>

:sparkles: Function β€œreverseArrayInPlace()” (own solution by me β€˜OtenMoten’)

<HEAD>
    <Script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js" ></SCRIPT>
</HEAD>
<BODY>
    <SCRIPT>
        function iReverseArrayInPlace(inputArray) {
            let outputArray = [];
            let iSize = inputArray.length;

            for (var i = 0; i < iSize; i++) {
                outputArray.push(inputArray.pop());
            }
            return outputArray;
        }

        let myArray = ["Ivan", "On", "Tech"];
        console.log(iReverseArrayInPlace(myArray));
    </SCRIPT>
</BODY>

Cheers
OtenMoten :space_invader:

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#121

Here is the part for Reversing the Array in Place.

var originalArray=[1,2,3,4,5];
var reverseArray=[];
var FinalArray=[];
length=originalArray.length

reverseInPlaceFunction(originalArray,length);
function reverseInPlaceFunction(arrayName,arrayLength){
for (i=arrayLength; i>=1;i=i-1) {
reverseArray.unshift(arrayLength-i+1);}};

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#122

Sum and Range:
function range(start, end, step = start<end ? 1 : -1){
var ans = [];
if (step > 0) {
for (let i = start; i <= end; i += step) ans.push(i);
} else {
for (let i = start; i >= end; i += step) ans.push(i);
}
return ans;
}
function sum(num){
let s = 0;
for(let i =0;i<num.length;i++){
s=s+num[i]
}
console.log(s);
}
console.log(sum(range(1,10)));

Reversing an Array:
let array1 = [β€œone”, β€œtwo”, β€œthree”, β€œfour”, β€œfive”, β€œsix”, β€œseven”];
let array2 = [1,2,3,4,5,6,7,8];
function reverseArray(arr) {
let newArray = [];
for (let i = arr.length - 1; i >= 0; i–) {
newArray.push(arr[i]);
}
return newArray;
}
function reverseArrayInPlace(arr) {
for (var i = 0; i <= Math.floor((arr.length-1) / 2); i++) {
let rAIP = arr[i];
arr[i] = arr[arr.length - 1 - i];
arr[arr.length - 1 - i] = rAIP;
}
return arr;
}
console.log(reverseArrayInPlace(array1));

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