39 lines
1.4 KiB
JavaScript
39 lines
1.4 KiB
JavaScript
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//#region src/array/fill.ts
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/**
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* Fills elements of an array with a specified value from the start position up to, but not including, the end position.
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*
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* This function mutates the original array and replaces its elements with the provided value, starting from the specified
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* start index up to the end index (non-inclusive). If the start or end indices are not provided, it defaults to filling the
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* entire array.
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*
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* @template T - The type of elements in the original array.
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* @template U - The type of the value to fill the array with.
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* @param {Array<T | U>} array - The array to fill.
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* @param {U} value - The value to fill the array with.
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* @param {number} [start=0] - The start position. Defaults to 0.
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* @param {number} [end=arr.length] - The end position. Defaults to the array's length.
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* @returns {Array<T | U>} The array with the filled values.
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*
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* @example
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* fill([1, 2, 3], 'a');
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* // => ['a', 'a', 'a']
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*
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* fill(Array(3), 2);
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* // => [2, 2, 2]
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*
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* fill([4, 6, 8, 10], '*', 1, 3);
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* // => [4, '*', '*', 10]
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*
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* fill([1, 2, 3], '*', -2, -1);
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* // => [1, '*', 3]
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*/
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function fill(array, value, start = 0, end = array.length) {
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const length = array.length;
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const finalStart = Math.max(start >= 0 ? start : length + start, 0);
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const finalEnd = Math.min(end >= 0 ? end : length + end, length);
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for (let i = finalStart; i < finalEnd; i++) array[i] = value;
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return array;
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}
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//#endregion
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export { fill };
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