@newdash/newdash/.internal/isIndex.js

javascript/typescript utility library

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Used as references for various `Number` constants.
 * @ignore
 */
const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER || 9007199254740991;
/**
 * Used to detect unsigned integer values.
 * @ignore
 */
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);
}
exports.default = isIndex;