如何以非阻塞方式在 Node.js 中搜索数组？
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How to search in an array in Node.js in a non-blocking way?
提问by piggyback
I have an array which is:
我有一个数组，它是：
[ 4ff023908ed2842c1265d9e4, 4ff0d75c8ed2842c1266099b ]
And I have to find if the following, is inside that array
我必须找到以下内容是否在该数组中
4ff0d75c8ed2842c1266099b
Here is what I wrote:
这是我写的：
Array.prototype.contains = function(k) {
for(p in this)
if(this[p] === k)
return true;
return false;
}
Apparently, it doesn't work properly, or better sometimes it works, but it looks to me blocking. Is there anyone that can check that one?
显然，它不能正常工作，或者有时它工作得更好，但在我看来它是阻塞的。有没有人可以检查一下？
many thanks
非常感谢
回答by penartur
Non-blocking search function
非阻塞搜索功能
Array.prototype.contains = function(k, callback) {
var self = this;
return (function check(i) {
if (i >= self.length) {
return callback(false);
}
if (self[i] === k) {
return callback(true);
}
return process.nextTick(check.bind(null, i+1));
}(0));
}
Usage:
用法：
[1, 2, 3, 4, 5].contains(3, function(found) {
if (found) {
console.log("Found");
} else {
console.log("Not found");
}
});
However, for searching the value in the array it is better to use Javascript built-in array search function, as it will be much faster (so that you probably won't need it to be non-blocking):
但是，为了搜索数组中的值，最好使用 Javascript 内置的数组搜索功能，因为它会快得多（因此您可能不需要它是非阻塞的）：
if ([1, 2, 3, 4, 5].indexOf(3) >= 0) {
console.log("Found");
} else {
console.log("Not found");
}
Also, consider the underscorelibrary which makes all the stuff cross-platform: http://underscorejs.org/
另外，请考虑underscore使所有内容跨平台的库：http: //underscorejs.org/
