161 lines
3.7 KiB
JavaScript
161 lines
3.7 KiB
JavaScript
/**
|
|
* lodash (Custom Build) <https://lodash.com/>
|
|
* Build: `lodash modularize exports="npm" -o ./`
|
|
* Copyright jQuery Foundation and other contributors <https://jquery.org/>
|
|
* Released under MIT license <https://lodash.com/license>
|
|
* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
|
|
* Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
|
|
*/
|
|
|
|
/** `Object#toString` result references. */
|
|
var symbolTag = '[object Symbol]';
|
|
|
|
/** Used for built-in method references. */
|
|
var objectProto = Object.prototype;
|
|
|
|
/**
|
|
* Used to resolve the
|
|
* [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
|
|
* of values.
|
|
*/
|
|
var objectToString = objectProto.toString;
|
|
|
|
/**
|
|
* The base implementation of methods like `_.max` and `_.min` which accepts a
|
|
* `comparator` to determine the extremum value.
|
|
*
|
|
* @private
|
|
* @param {Array} array The array to iterate over.
|
|
* @param {Function} iteratee The iteratee invoked per iteration.
|
|
* @param {Function} comparator The comparator used to compare values.
|
|
* @returns {*} Returns the extremum value.
|
|
*/
|
|
function baseExtremum(array, iteratee, comparator) {
|
|
var index = -1,
|
|
length = array.length;
|
|
|
|
while (++index < length) {
|
|
var value = array[index],
|
|
current = iteratee(value);
|
|
|
|
if (current != null && (computed === undefined
|
|
? (current === current && !isSymbol(current))
|
|
: comparator(current, computed)
|
|
)) {
|
|
var computed = current,
|
|
result = value;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `_.gt` which doesn't coerce arguments to numbers.
|
|
*
|
|
* @private
|
|
* @param {*} value The value to compare.
|
|
* @param {*} other The other value to compare.
|
|
* @returns {boolean} Returns `true` if `value` is greater than `other`,
|
|
* else `false`.
|
|
*/
|
|
function baseGt(value, other) {
|
|
return value > other;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is object-like. A value is object-like if it's not `null`
|
|
* and has a `typeof` result of "object".
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.0.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
|
|
* @example
|
|
*
|
|
* _.isObjectLike({});
|
|
* // => true
|
|
*
|
|
* _.isObjectLike([1, 2, 3]);
|
|
* // => true
|
|
*
|
|
* _.isObjectLike(_.noop);
|
|
* // => false
|
|
*
|
|
* _.isObjectLike(null);
|
|
* // => false
|
|
*/
|
|
function isObjectLike(value) {
|
|
return !!value && typeof value == 'object';
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is classified as a `Symbol` primitive or object.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.0.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is correctly classified,
|
|
* else `false`.
|
|
* @example
|
|
*
|
|
* _.isSymbol(Symbol.iterator);
|
|
* // => true
|
|
*
|
|
* _.isSymbol('abc');
|
|
* // => false
|
|
*/
|
|
function isSymbol(value) {
|
|
return typeof value == 'symbol' ||
|
|
(isObjectLike(value) && objectToString.call(value) == symbolTag);
|
|
}
|
|
|
|
/**
|
|
* This method returns the first argument given to it.
|
|
*
|
|
* @static
|
|
* @since 0.1.0
|
|
* @memberOf _
|
|
* @category Util
|
|
* @param {*} value Any value.
|
|
* @returns {*} Returns `value`.
|
|
* @example
|
|
*
|
|
* var object = { 'user': 'fred' };
|
|
*
|
|
* _.identity(object) === object;
|
|
* // => true
|
|
*/
|
|
function identity(value) {
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* Computes the maximum value of `array`. If `array` is empty or falsey,
|
|
* `undefined` is returned.
|
|
*
|
|
* @static
|
|
* @since 0.1.0
|
|
* @memberOf _
|
|
* @category Math
|
|
* @param {Array} array The array to iterate over.
|
|
* @returns {*} Returns the maximum value.
|
|
* @example
|
|
*
|
|
* _.max([4, 2, 8, 6]);
|
|
* // => 8
|
|
*
|
|
* _.max([]);
|
|
* // => undefined
|
|
*/
|
|
function max(array) {
|
|
return (array && array.length)
|
|
? baseExtremum(array, identity, baseGt)
|
|
: undefined;
|
|
}
|
|
|
|
module.exports = max;
|