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A collection of simple but powerful JS code 🌈

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复制正则

const cloneRegExp = regExp => new RegExp(regExp.source, regExp.flags)

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Average

const average = (...args) => args.reduce((acc, val) => acc + val, 0) / args.length

AverageBy

const averageBy = (...args, fn) =>
  args.map(typeof fn === 'function' ? fn : val => val[fn])
      .reduce((acc, val) => acc + val, 0) / args.length

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Ary

/**
 *
 * 用来控制传入参数个数
 *
 * @param    {Function}  fn     要改变的函数名
 * @param    {Number}    n      最多的可应用参数个数
 * @returns  {Function}         已格式化好的函数
 *
 */

const ary = (fn, n) => (...args) => fn(...args.slice(0, n))

Unary

/**
 *
 * Creates a function that accepts up to one argument, 
 * ignoring any additional arguments.
 *
 * @param    {Function}  fn     要改变的函数名
 * @param    {Number}    args   参数
 * @returns  {Function}         已格式化好的函数
 *
 */

const ary = (fn) => arg => fn(arg)