freeCodeCamp/write-arrow-functions-with-parameters.chinese.md at 6ee9f2351407b4dea6a9bccd5dac28e7df8fa484

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id, title, challengeType, videoUrl, localeTitle

id	title	challengeType	videoUrl	localeTitle
587d7b88367417b2b2512b44	Write Arrow Functions with Parameters	1		用参数写箭头函数

Description

就像普通函数一样，您可以将参数传递给箭头函数。

//将输入值加倍并返回
const doubler =（item）=> item * 2;

您也可以将多个参数传递给箭头函数。

Instructions

重写myConcat函数，该函数将arr2内容追加到arr1以便该函数使用箭头函数语法。

Tests

tests:
  - text: 用户确实替换了<code>var</code>关键字。
    testString: 'getUserInput => assert(!getUserInput("index").match(/var/g), "User did replace <code>var</code> keyword.");'
  - text: <code>myConcat</code>应该是一个常量变量（使用<code>const</code> ）。
    testString: 'getUserInput => assert(getUserInput("index").match(/const\s+myConcat/g), "<code>myConcat</code> should be a constant variable (by using <code>const</code>).");'
  - text: <code>myConcat</code>应该是一个函数
    testString: 'assert(typeof myConcat === "function", "<code>myConcat</code> should be a function");'
  - text: <code>myConcat()</code>返回正确的<code>array</code>
    testString: 'assert(() => { const a = myConcat([1], [2]); return a[0] == 1 && a[1] == 2; }, "<code>myConcat()</code> returns the correct <code>array</code>");'
  - text: <code>function</code>关键字未使用。
    testString: 'getUserInput => assert(!getUserInput("index").match(/function/g), "<code>function</code> keyword was not used.");'

Challenge Seed

var myConcat = function(arr1, arr2) {
  "use strict";
  return arr1.concat(arr2);
};
// test your code
console.log(myConcat([1, 2], [3, 4, 5]));

Solution

// solution required

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