Javascript javascript数组映射方法中的break语句
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Break statement in javascript array map method
提问by Mudassir Ali
Possible Duplicate:
How to short circuit Array.forEach like calling break?
Is there a way so that I can break out of array map method after my condition is met ? I tried the following which throws "Illegal Break Statement" Error.This is some random example I came up with.
有没有办法在满足我的条件后突破数组映射方法？我尝试了以下抛出"Illegal Break Statement" Error.这是我想出的一些随机示例。
var myArray = [22,34,5,67,99,0];
var hasValueLessThanTen = false;
myArray.map(function (value){
if(value<10){
hasValueLessThanTen = true;
break;
}
}
);
We can do using forloops, but I wanted to know whether we can accomplish the same using mapmethod ?
我们可以使用for循环，但我想知道我们是否可以使用map方法完成相同的操作？
回答by Jo?o Silva
That's not possible using the built-in Array.prototype.map. However, you could use a simple for-loop instead, if you do not intend to mapany values:
使用内置的Array.prototype.map. 但是，for如果您不打算使用map任何值，则可以改用简单的-loop ：
var hasValueLessThanTen = false;
for (var i = 0; i < myArray.length; i++) {
if (myArray[i] < 10) {
hasValueLessThanTen = true;
break;
}
}
Or, as suggested by @RobW, use Array.prototype.someto test if there exists at least one element that is less than 10. It will stop looping when some element that matches your function is found:
或者，如 所建议的@RobW，用于Array.prototype.some测试是否存在至少一个小于 10 的元素。当找到与您的函数匹配的某个元素时，它将停止循环：
var hasValueLessThanTen = myArray.some(function (val) {
return val < 10;
});
