在 nodeJS/JavaScript 中连接字符串的快速方法
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Fast way to concatenate strings in nodeJS/JavaScript
提问by Yotam
I understand that doing something like
我明白做类似的事情
var a = "hello";
a += " world";
It is relatively very slow, as the browser does that in O(n). Is there a faster way of doing so without installing new libraries?
它相对非常慢，因为浏览器在O(n). 在不安装新库的情况下，是否有更快的方法？
回答by Mustafa
The question is already answered, however when I first saw it I thought of NodeJS Buffer. But it is way slower than the +, so it is likely that nothing can be faster than + in string concetanation.
这个问题已经回答了，但是当我第一次看到它时，我想到了 NodeJS Buffer。但它比 + 慢得多，所以很可能没有比 + 在字符串合并中更快的了。
Tested with the following code:
使用以下代码进行测试：
function a(){
var s = "hello";
var p = "world";
s = s + p;
return s;
}
function b(){
var s = new Buffer("hello");
var p = new Buffer("world");
s = Buffer.concat([s,p]);
return s;
}
var times = 100000;
var t1 = new Date();
for( var i = 0; i < times; i++){
a();
}
var t2 = new Date();
console.log("Normal took: " + (t2-t1) + " ms.");
for ( var i = 0; i < times; i++){
b();
}
var t3 = new Date();
console.log("Buffer took: " + (t3-t2) + " ms.");
Output:
输出：
Normal took: 4 ms.
Buffer took: 458 ms.
回答by Cerbrus
There is not really any other way in JavaScript to concatenate strings.
You could theoretically use .concat(), but that's way slowerthan just +
JavaScript 中没有任何其他方法可以连接字符串。
理论上你可以使用.concat()，但这比仅仅慢+
Libraries are more often than not slower than native JavaScript, especially on basic operations like string concatenation, or numerical operations.
库通常比原生 JavaScript 慢，尤其是在字符串连接或数字运算等基本操作上。
Simply put: +is the fastest.
简单地说：+是最快的。
