| // 摘自Secrets of the JavaScript Ninja | |
| function argumentNames(fn) { | |
| var found = /^[\s\(]*function[^(]*\(\s*([^)]*?)\s*\)/.exec(fn.toString()); | |
| return found && found[1] ? found[1].split(/,\s*/) : []; | |
| } | |
| argumentNames(function(x){})[0] === "x" |
cron is a utility that you can use to schedule and automate tasks. By defining items in the cron table, called crontab, you can schedule any script or program to run on almost any sort of schedule. For example, Research [Flagship Merchant Services][1] on Thursday at 6:30pm.
For example, run a [program][2] each day 5 minutes after midnight on mondays, wednesdays and fridays. Or schedule something to run every five minutes, or once a month.
| function createArrayIterator(coll) { | |
| var i = -1; | |
| var len = coll.length; | |
| return function next() { | |
| return ++i < len ? {value: coll[i], key: i} : null; | |
| } | |
| } | |
| function eachLimit(coll, limit, iteratee) { | |
| if (limit <= 0 || !coll) return Promise.resolve(); |
| function defaultHasher() { | |
| return JSON.stringify(arguments); | |
| } | |
| function asyncMemoize(fn, hasher=defaultHasher) { | |
| async function memozie() { | |
| let cache = memozie.cache; | |
| const key = hasher(arguments); | |
| if (!cache.hasOwnProperty(key)) { |
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