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insertAt javascript Code Snippet in 2024

arrayintermediate

Last Updated: 13 May 2024

Mutates the original array to insert the given values after the specified index.

  • Use Array.prototype.splice() with an appropriate index and a delete count of 0, spreading the given values to be inserted.
const insertAt = (arr, i, ...v) => { arr.splice(i + 1, 0, ...v); return arr; };
let myArray = [1, 2, 3, 4]; insertAt(myArray, 2, 5); // myArray = [1, 2, 3, 5, 4] let otherArray = [2, 10]; insertAt(otherArray, 0, 4, 6, 8); // otherArray = [2, 4, 6, 8, 10]

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