Can we slice string in array

Question

I have an array like below

array_object = [video1.mp4 , video2.mp4 , video3.mp4];

I like to remove the .mp4 from the array so i used

array = array_object.slice(0,-4);

but it not working cause the string is in array. are there anyway to delete the .mp4 even it inside the array.

Possible duplicate of Javascript map method on array of string elements — Redu
– Redu, Commented May 23, 2018 at 15:46

Get Off My Lawn · Accepted Answer · 2018-05-23 14:36:32Z

3

You need to loop over the items. This can be done with an array map.

const array_object = ['video1.mp4', 'video2.mp4', 'video3.mp4'];

const new_array = array_object.map(item => item.slice(0, -4));

console.log(new_array);

answered May 23, 2018 at 14:36

Get Off My Lawn

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Comments

Willem van der Veen · Accepted Answer · 2018-05-23 14:46:32Z

As get of my lawn said use array.map. Array.map gets as an argument a callback function which gets executed on every element of the array. Then a new array is returned. For example:

const array_object = ['video1.mp4', 'video2.mp4', 'video3.mp4'];

const new_array = array_object.map(item => item.slice(0, -4));

console.log(array_object === new_array); // logs false a new array is returned;

The function which is passed in map gets every array index as an argument:

item => item.slice(0, -4)

Then on every element the function is performed and put in the index of the new array.

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