1234567891011121314151617181920212223 |
- // @ts-nocheck
- /** Used as references for various `Number` constants. */
- const MAX_SAFE_INTEGER = 9007199254740991;
- /** Used to detect unsigned integer values. */
- const reIsUint = /^(?:0|[1-9]\d*)$/;
- /**
- * Checks if `value` is a valid array-like index.
- *
- * @private
- * @param {*} value The value to check.
- * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
- * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
- */
- function isIndex(value, length) {
- const type = typeof value;
- length = length == null ? MAX_SAFE_INTEGER : length;
- return (!!length &&
- (type === "number" || (type !== "symbol" && reIsUint.test(value))) &&
- value > -1 &&
- value % 1 === 0 &&
- value < length);
- }
- export default isIndex;
|