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takeUntil javascript Code Snippet in 2024

arrayintermediate

Last Updated: 13 May 2024

Removes elements in an array until the passed function returns true. Returns the removed elements.

  • Loop through the array, using a for...of loop over Array.prototype.entries() until the returned value from the function is truthy.
  • Return the removed elements, using Array.prototype.slice().
  • The callback function, fn, accepts a single argument which is the value of the element.
const takeUntil = (arr, fn) => { for (const [i, val] of arr.entries()) if (fn(val)) return arr.slice(0, i); return arr; };
takeUntil([1, 2, 3, 4], n => n >= 3); // [1, 2]

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