24 lines
797 B
JavaScript
24 lines
797 B
JavaScript
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// @ts-nocheck
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/** Used as references for various `Number` constants. */
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const MAX_SAFE_INTEGER = 9007199254740991;
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/** Used to detect unsigned integer values. */
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const reIsUint = /^(?:0|[1-9]\d*)$/;
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/**
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* Checks if `value` is a valid array-like index.
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*
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* @private
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* @param {*} value The value to check.
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* @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
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* @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
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*/
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function isIndex(value, length) {
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const type = typeof value;
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length = length == null ? MAX_SAFE_INTEGER : length;
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return (!!length &&
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(type === "number" || (type !== "symbol" && reIsUint.test(value))) &&
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value > -1 &&
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value % 1 === 0 &&
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value < length);
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}
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export default isIndex;
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