javascript 跳出 _.each 循环
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Break out of an _.each loop
提问by Billy Moon
Is it possible to break out of an underscore each loop..?
是否有可能打破每个循环的下划线..？
_.each(obj, function(v,i){
if(i > 2){
break // <~ does not work
}
// some code here
// ...
})
Is there another design pattern I can be using?
我可以使用另一种设计模式吗？
回答by Explosion Pills
I don't think you can, so you will just have to wrap the contents of the function in i < 2or use return. It may make more sense to use .someor .every.
我认为您不能，因此您只需要将函数的内容包装在i < 2或使用return. 使用.someor可能更有意义.every。
EDIT:
编辑：
//pseudo break
_.each(obj, function (v, i) {
if (i <= 2) {
// some code here
// ...
}
});
The issue with the above is of course that it has to do the entire loop, but that is simply a weakness of underscore's each.
上面的问题当然是它必须完成整个循环，但这只是下划线的弱点each。
You could use .every, though (either native array method or underscore's method):
不过，您可以使用.every（本机数组方法或下划线方法）：
_.every(obj, function (v, i) {
// some code here
// ...
return i <= 2;
});
回答by adpmatos
For now you cannot break an each loop. It is being discussed here: https://github.com/documentcloud/underscore/issues/596
现在你不能打破每个循环。这里正在讨论：https: //github.com/documentcloud/underscore/issues/596
Maybe on a future version.
也许在未来的版本中。
