32 lines
1.1 KiB
JavaScript
32 lines
1.1 KiB
JavaScript
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//#region src/math/rangeRight.ts
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/**
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* Returns an array of numbers from `end` (exclusive) to `start` (inclusive), decrementing by `step`.
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*
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* @param {number} start - The starting number of the range (inclusive).
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* @param {number} end - The end number of the range (exclusive).
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* @param {number} step - The step value for the range.
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* @returns {number[]} An array of numbers from `end` (exclusive) to `start` (inclusive) with the specified `step`.
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* @throws {Error} Throws an error if the step value is not a non-zero integer.
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*
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* @example
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* // Returns [3, 2, 1, 0]
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* rangeRight(4);
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*
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* @example
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* // Returns [-3, -2, -1, 0]
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* rangeRight(0, -4, -1);
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*/
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function rangeRight(start, end, step = 1) {
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if (end == null) {
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end = start;
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start = 0;
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}
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if (!Number.isInteger(step) || step === 0) throw new Error(`The step value must be a non-zero integer.`);
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const length = Math.max(Math.ceil((end - start) / step), 0);
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const result = new Array(length);
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for (let i = 0; i < length; i++) result[i] = start + (length - i - 1) * step;
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return result;
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}
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//#endregion
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export { rangeRight };
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