Which one is quicker?
let str = '';
for(let i=0; i<1000; i++) {
str += i;
}
or
let arr = [];
for(let i=0; i<1000; i++) {
arr.push(i);
}
let str = arr.join('');
I am curious about the speed difference between these two methods. I have developed a CSS parser that performs well, but struggles with larger stylesheets due to its speed. I am exploring ways to optimize it, and I am wondering if this would make any impact. Thank you in advance!
In a comparison between string concatenation and array join for speed (this thread provides insight), it is evident that string concatenation is faster, as demonstrated in the following test:
function concatStrings() {
var str = '';
for (var i = 0; i < 1000; i++) {
str += i;
}
}
function joinArray() {
var arr = [];
for (var i = 0; i < 1000; i++) {
arr.push(i);
}
var str = arr.join('');
}
var startTime = new Date();
for (var counter = 0; counter < 10000; counter++) {
concatStrings()
}
var endTime = new Date();
alert("String Concatenation Time: " + (endTime - startTime));
var startTime = new Date();
for (var counter = 0; counter < 10000; counter++) {
joinArray()
}
var endTime = new Date();
alert("Array Join Time: " + (endTime - startTime));The results show that string concatenation takes only one-third of the time compared to Array join.
console.time('b')
var total = '';
for(var x=0; x<10000; x++) {
total += x;
}
console.timeEnd('b')
VM607:6 b: 1.870ms
console.time('b')
var numbers = [];
for(var y=0; y<10000; y++) {
numbers.push(y);
}
var result = numbers.join('');
console.timeEnd('b')
VM618:7 b: 2.629ms
After conducting some performance tests, it became evident that the length of the string plays a crucial role, particularly when using the Array.prototype.join() method. It is advisable to avoid unnecessary string concatenation for better results.
String Concatenation:
var t = 0,
p = 0,
s = "",
i = 0;
while (t<=1000) {
p = performance.now();
s +=i;
t += performance.now()-p;
i++;
}
document.write("<pre> Completed " + i + " string concat operations per second</pre>");Using Array.push() and Array.join():
var t = 0,
p = 0,
a = [],
s = "",
i = 0;
while (t<=1000) {
p = performance.now();
a.push(i)
s = a.join("")
t += performance.now()-p;
i++;
}
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