@feugene/mu
Version:
Helpful TS utilities without dependencies
23 lines • 824 B
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = isIndex;
/** Used as references for various `Number` constants. */
const vars_1 = require("../core/vars");
/**
* 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 ? Number.MAX_SAFE_INTEGER : length;
return (!!length &&
(type === 'number' || (type !== 'symbol' && vars_1.reIsUint.test(value))) &&
value > -1 &&
value % 1 === 0 &&
value < length);
}
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