Find the index
of the array element you want to remove using indexOf
, and then remove that index with splice
.
The splice() method changes the contents of an array by removing existing elements and/or adding new elements.
const array = [2, 5, 9]; console.log(array); const index = array.indexOf(5); if (index > -1) { array.splice(index, 1); } // array = [2, 9] console.log(array);
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The second parameter of splice
is the number of elements to remove. Note that splice
modifies the array in place and returns a new array containing the elements that have been removed.
For the reason of completeness, here are functions. The first function removes only a single occurrence (i.e. removing the first match of 5
from [2,5,9,1,5,8,5]
), while the second function removes all occurrences:
function removeItemOnce(arr, value) { var index = arr.indexOf(value); if (index > -1) { arr.splice(index, 1); } return arr; } function removeItemAll(arr, value) { var i = 0; while (i < arr.length) { if (arr[i] === value) { arr.splice(i, 1); } else { ++i; } } return arr; } // Usage console.log(removeItemOnce([2,5,9,1,5,8,5], 5)) console.log(removeItemAll([2,5,9,1,5,8,5], 5))
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In TypeScript, these functions can stay type-safe with a type parameter:
function removeItem<T>(arr: Array<T>, value: T): Array<T> { const index = arr.indexOf(value); if (index > -1) { arr.splice(index, 1); } return arr; }