I implemented a function to get a shallow copy of an array without a specific element (using its index).
But I have to call three methods to achieve this. Is there a better way of doing this?
const arrayWithoutElementAtIndex = function (arr, index) {
return arr.slice(0, index).concat(arr.slice(index + 1))
}
arrayWithoutElementAtIndex([1, 2, 4, 8, 16, 32, 64], 3) // [1, 2, 4, 16, 32, 64]
How about a regular filter?
const arrayWithoutElementAtIndex = function (arr, index) {
return arr.filter(function(value, arrIndex) {
return index !== arrIndex;
});
}
document.write(arrayWithoutElementAtIndex([1, 2, 4, 8, 16, 32, 64], 3)); // [1, 2, 4, 16, 32, 64]This would mean you only have a single function and it returns a new array instance.
fn keyword. Writing function everywhere makes one-liner so hard to fit in 80 characters.
const arrayWithoutElementAtIndex = (arr, index, newArr = [...arr]) => (newArr.splice(index,1), newArr), you can see my answer edition. Excuse my english
const filter = (arr, index) => arr.filter((_, i) => index !== i);You can do it in 2 operation using splice(), but won't be looking that nice
'use strict'
const arrayWithoutElementAtIndex = function(arr, index) {
var ret = arr.slice(); //make a copy
ret.splice(index, 1); //remove the item from given index
return ret; //return the copy
}
var array = [1, 2, 4, 8, 16, 32, 64];
var array2 = arrayWithoutElementAtIndex(array, 3) // [1, 2, 4, 16, 32, 64]
snippet.log(array)
snippet.log(array2)<!-- Provides the `snippet` object, see http://meta.stackexchange.com/a/242144/134069 -->
<script src="http://tjcrowder.github.io/simple-snippets-console/snippet.js"></script>With lodash:
_(this.state.additionalOwners, index).splice(index, 1).value())
