mirror of
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105 lines
3.3 KiB
JavaScript
105 lines
3.3 KiB
JavaScript
/**
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* lodash (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright jQuery Foundation and other contributors <https://jquery.org/>
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* Released under MIT license <https://lodash.com/license>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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*/
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/** Used as the `TypeError` message for "Functions" methods. */
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var FUNC_ERROR_TEXT = 'Expected a function';
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/**
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* A faster alternative to `Function#apply`, this function invokes `func`
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* with the `this` binding of `thisArg` and the arguments of `args`.
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*
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* @private
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* @param {Function} func The function to invoke.
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* @param {*} thisArg The `this` binding of `func`.
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* @param {Array} args The arguments to invoke `func` with.
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* @returns {*} Returns the result of `func`.
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*/
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function apply(func, thisArg, args) {
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switch (args.length) {
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case 0: return func.call(thisArg);
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case 1: return func.call(thisArg, args[0]);
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case 2: return func.call(thisArg, args[0], args[1]);
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case 3: return func.call(thisArg, args[0], args[1], args[2]);
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}
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return func.apply(thisArg, args);
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}
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/* Built-in method references for those with the same name as other `lodash` methods. */
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var nativeMax = Math.max;
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/**
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* The base implementation of `_.delay` and `_.defer` which accepts `args`
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* to provide to `func`.
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*
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* @private
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* @param {Function} func The function to delay.
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* @param {number} wait The number of milliseconds to delay invocation.
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* @param {Array} args The arguments to provide to `func`.
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* @returns {number|Object} Returns the timer id or timeout object.
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*/
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function baseDelay(func, wait, args) {
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if (typeof func != 'function') {
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throw new TypeError(FUNC_ERROR_TEXT);
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}
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return setTimeout(function() { func.apply(undefined, args); }, wait);
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}
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/**
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* The base implementation of `_.rest` which doesn't validate or coerce arguments.
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*
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* @private
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* @param {Function} func The function to apply a rest parameter to.
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* @param {number} [start=func.length-1] The start position of the rest parameter.
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* @returns {Function} Returns the new function.
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*/
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function baseRest(func, start) {
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start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
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return function() {
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var args = arguments,
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index = -1,
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length = nativeMax(args.length - start, 0),
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array = Array(length);
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while (++index < length) {
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array[index] = args[start + index];
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}
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index = -1;
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var otherArgs = Array(start + 1);
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while (++index < start) {
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otherArgs[index] = args[index];
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}
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otherArgs[start] = array;
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return apply(func, this, otherArgs);
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};
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}
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/**
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* Defers invoking the `func` until the current call stack has cleared. Any
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* additional arguments are provided to `func` when it's invoked.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Function
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* @param {Function} func The function to defer.
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* @param {...*} [args] The arguments to invoke `func` with.
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* @returns {number} Returns the timer id.
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* @example
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*
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* _.defer(function(text) {
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* console.log(text);
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* }, 'deferred');
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* // => Logs 'deferred' after one or more milliseconds.
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*/
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var defer = baseRest(function(func, args) {
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return baseDelay(func, 1, args);
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});
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module.exports = defer;
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