The task is to convert an integer array to a string array in JavaScript. Here are a few of the most used techniques discussed with the help of JavaScript.

Approaches to convert Integer array to String array:

Approach 1: using JavaScript array.map() and toString() methods

In this approach, we use the .toString() method on every element of the array with the help of the .map() method.

Example: This example uses the approach discussed above. 

let Arr = [1, 4, 56, 43, 67, 98];

function gfg_Run() {
    let strArr = Arr.map(function (e) {
        return e.toString()
    });

    console.log("Array - " + strArr +
        "\ntypeof(Array[0]) - " + typeof (strArr[0]));
}

gfg_Run();

Array - 1,4,56,43,67,98
typeof(Array[0]) - string

Approach 2: Using JavaScript Array.join() and split() methods

In this approach, we use the join() method which joins the array and returns it as a string. Then split() method splits the string on ", " returned by the join() method.

Example: This example uses the approach discussed above. 

let Arr = [1, 4, 56, 43, 67, 98];

function gfg_Run() {
    let strArr = Arr.join().split(', ');

    console.log("Array - " + strArr +
        "\ntypeof(Array[0]) - " + typeof (strArr[0]));
}

gfg_Run();

Array - 1,4,56,43,67,98
typeof(Array[0]) - string

Approach 3: Using JavaScript Array.forEach() and String constructor

In this approach, we will use JavaScript Array.forEach() to iterate the array and use String constructor to convert them into string type.

Example:

This example uses the approach discussed above. 

const Arr = [1, 2, 3, 4, 5];
const strArr = [];

Arr.forEach(function (num) {
    strArr.push(String(num));
});
console.log(
    "Array - " + strArr +
     "\ntypeof(Array[0]) - " 
     + typeof strArr[0]
);

Array - 1,2,3,4,5
typeof(Array[0]) - string

Approach 4: Using Array.from() Method with a Mapping Function

In this approach, we use the Array.from() method, which creates a new array instance from an array-like or iterable object. We pass a mapping function as the second argument to convert each element to a string.

Example:

const integerArray = [10, 20, 30, 40, 50];

const stringArray = Array.from(integerArray, num => num.toString());

console.log("Array - " + stringArray + "\ntypeof(Array[0]) - " + typeof stringArray[0]);

Array - 10,20,30,40,50
typeof(Array[0]) - string