JavaScript Array Methods
- Converting Arrays to Strings: To convert an Array to string we use the method toString( ).
Example:
var colors= [“Red”, “Yellow”, “Orange”, “Blue”]; console.log( colors.toString( ));
2. Popping: The pop( ) method removes the last element from an array.
Example:
Before
var fruits = [“Banana”, “Orange”, “Apple”, “Mango”];
fruits.pop();
After
[“Banana”, “Orange”, “Apple”]
3. Pushing: Push( ) method adds a new element at the end of and array.
Example:
Before
var fruits = [“Banana”, “Orange”, “Apple”, “Mango”];
fruits.push(“Grape”);
After
[“Banana”, “Orange”, “Apple”, “Mango”, ”Grape”];
4. Shifting: The shift( ) method removes the element in the first index and the elements gets lower index.
Example:
Before
var fruits = [“Banana”, “Orange”, “Apple”, “Mango”];
fruits.shift( );
After
[ “Orange”, “Apple”, “Mango”, ”Grape”];
5. unshifting: The unshift( ) method adds a new element in the beginning of the array.
Example:
Before
var fruits = [“Banana”, “Orange”, “Apple”, “Mango”];
fruits.unshift( Kiwi );
After
[ “Kiwi“,Orange”, “Apple”, “Mango”, ”Grape”];
6. Changing Elements: The elements can be changed by accessing their index numbers.
Example:
Before
var fruits = [“Banana”, “Orange”, “Apple”, “Mango”];
fruits[0] = “Strawberry”;
After
[“Strawberry”, “Orange”, “Apple”, “Mango”];
7. Deleting Elements: Elements can be deleted using Javascript operator delete.
Example:
var fruits = [“Banana”, “Orange”, “Apple”, “Mango”];
delete fruits[0];
//In this case the the first element changes to undefined.
8. Splice: The splice( ) method can be used to add new items to an array.
Example:
Before
var fruits = [“Banana”, “Orange”, “Apple”, “Mango”];
fruits.splice(2, 0, “Strawberry”, “Kiwi”);
After
[“Banana”, “Orange”, “Strawberry”, “Kiwi”, “Apple”, “Mango”];
9. Remove with splice :to remove elements without leaving "holes" in the array we can also use splice( ).
Example:
Before
var fruits = [“Banana”, “Orange”, “Apple”, “Mango”];
fruits.splice( 0 , 1);
After
[ “Orange”, “Apple”, “Mango”, ];
10. Merging (Concatenating) Arrays: The concat ( )method is used to merge a new array with existing arrays.
Example:
Before
var myGirls = [“Lisa”, “Anna”];
var myBoys = [“Jack”, “Ramzi”, “Drake”];
var myChildren = myGirls.concat(myBoys);
After
Lisa, Anna, Jack, Ramzi, Drake
Reference: W3school