You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
26 lines
759 B
26 lines
759 B
3 years ago
|
/** 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;
|