Javascript 使用箭头函数循环遍历值数组
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Loop through array of values with Arrow Function
提问by PositiveGuy
Lets say I have:
可以说我有：
var someValues = [1, 'abc', 3, 'sss'];
How can I use an arrow function to loop through each and perform an operation on each value?
如何使用箭头函数循环遍历每个值并对每个值执行操作？
回答by Long Nguyen
In short:
简而言之：
someValues.forEach((element) => {
console.log(element);
});
If you care about index, then second parameter can be passed to receive the index of current element:
如果你关心索引，那么可以传递第二个参数来接收当前元素的索引：
someValues.forEach((element, index) => {
console.log(`Current index: ${index}`);
console.log(element);
});
Refer here to know more about Array of ES6: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
请参阅此处了解有关 ES6 数组的更多信息：https: //developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
回答by monnef
One statement can be written as such:
一个语句可以写成这样：
someValues.forEach(x => console.log(x));
or multiple statements can be enclosed in {}like this:
或者多个语句可以{}像这样包含在：
someValues.forEach(x => { let a = 2 + x; console.log(a); });
