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Basic Array Methods

JavaScript a lot of methods which can be used with Arrays to acheive desired results. Here we will try to see some of them:

toString()

The JavaScript method toString() converts an array to a string of (comma separated) array values.

Example:
var stud = ["Adarsh", "Shivam", "Harsh", "Utkarsh"];
var z = stud.toString();
Here z wll store Adarsh,Shivam,Harsh,Utkarsh

join():

This method also joins all array elements into a string but in addition here we can specify the separator.

Example:
var stud = ["Adarsh", "Shivam", "Harsh", "Utkarsh"];
var z = stud.join(" * ");
Here z wll store Adarsh * Shivam * Harsh * Utkarsh

push():

This method adds a new element to an array (at the end):

Example:
var stud = ["Adarsh", "Shivam", "Harsh"];
stud.push("Utkarsh");
Now stud array wll become: ["Adarsh", "Shivam", "Harsh", "Utkarsh"]

pop():

This method removes the last element from an array.

Example:
var stud = ["Adarsh", "Shivam", "Harsh","Utkarsh"];
stud.pop();
Now stud array will become: ["Adarsh", "Shivam", "Harsh"]

shift():

This method removes the first array element and “shifts” all other elements to a lower index.

Example:
var stud = ["Adarsh", "Shivam", "Harsh","Utkarsh"];
stud.shift();
Now stud array will become: ["Shivam", "Harsh"," Utkarsh"]

unshift():

This method adds a new element to an array (at the beginning), and “unshifts” older elements:

Example:
var stud = ["Shivam", "Harsh","Utkarsh"];
stud.unshift("Adarsh");
Now stud array wll become: ["Adarsh","Shivam", "Harsh"," Utkarsh"]

concat():

This method creates a new array by merging (concatenating) existing arrays.

Example:
var stud1 = ["Adarsh", "Shivam"];
var stud2 = ["Harsh","Utkarsh"];
var stud = stud1.concat(stud2);
Now stud array will become: ["Adarsh", "Shivam", "Harsh","Utkarsh"]

Try the following example in the editor below.

You are given two integer arrays A and B, you have to delete first element of A and add that at the end of B and then append both the arrays. Finally, print the elements of merged array. For example: for A = [1, 2, 3] and B = [4,5], new array A = [2,3] and B = [4,5,1] and merged ans array = [2,3,4,5,1]. Please note you have to print one element of ans array in one line, so total outpur lines will be equal to the size of ans array.

Sample Input:

A = [1 2 3]
B = [4 5]

Sample Output:

2
3
4
5
1

 

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