Splice in javascript

The splice method modifies the original array by removing or replacing a new item in the array.the splice method has the following pattren of paramerters: splice(start, deleteCount, item1, item2, itemN).

The first one is the index at which we insert a value, The second one is for insert or replace. If it is greater than '0' then it will replace the current value with the existing values or if it is '0' then it will push the current value and move the other value to the right in the array. The other parameters are the values to be inserted into the array

Below is examples that will clarify the concept.

1) We push value at a specific index in the array.

1const numberz = ['one', 'three', 'four', 'five'];
2  numberz.splice(1, 0, 'two');
3  // inserts at index 1, between one and three
4  console.log(numberz); // expected output: Array ["one", "two", "three", "four", "five"]

In the above example, we push 'two' in-between 'one' and 'three'.

1) We replace value at a specific index in the array.

1const numberz = ['one', 'three', 'four', 'five'];
2  numberz.splice(1, 1, 'two');
3  // inserts at index 1, between one and three
4  console.log(numberz); // expected output: Array ["one", "two", "four", "five"]

In the above example, we replaced 'two' with 'three'.

Related Articles :

• Arrays
• indexOf javascript