|
|
- /** Used as references for various `Number` constants. */
- var MAX_SAFE_INTEGER = 9007199254740991;
-
- /** Used to detect unsigned integer values. */
- var 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) {
- var 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);
- }
-
- module.exports = isIndex;
|
