What's the best way to convert a number to a string in JavaScript? [closed]

Answer 1

like this:

var foo = 45;
var bar = '' + foo;

Actually, even though I typically do it like this for simple convenience, over 1,000s of iterations it appears for raw speed there is an advantage for .toString()

See Performance tests here (not by me, but found when I went to write my own): http://jsben.ch/#/ghQYR

Fastest based on the JSPerf test above: str = num.toString();

It should be noted that the difference in speed is not overly significant when you consider that it can do the conversion any way 1 Million times in 0.1 seconds.

Update: The speed seems to differ greatly by browser. In Chrome num + '' seems to be fastest based on this test http://jsben.ch/#/ghQYR

Update 2: Again based on my test above it should be noted that Firefox 20.0.1 executes the .toString() about 100 times slower than the '' + num sample.

Answer 2

I used https://jsperf.com to create a test case for the following cases:

number + ''
`${number}`
String(number)
number.toString()

https://jsperf.com/number-string-conversion-speed-comparison

As of 24th of July, 2018 the results say that number + '' is the fastest in Chrome, in Firefox that ties with template string literals.

Both String(number), and number.toString() are around 95% slower than the fastest option.

Answer 3

If I had to take everything into consideration, I will suggest following

var myint = 1;
var mystring = myint + '';
/*or int to string*/
myint = myint + ''

IMHO, its the fastest way to convert to string. Correct me if I am wrong.

Answer 4

Just come across this recently, method 3 and 4 are not appropriate because how the strings are copied and then put together. For a small program this problem is insignificant, but for any real web application this action where we have to deal with frequency string manipulations can affects the performance and readability.

Here is the link the read.

Answer 5

In my opinion n.toString() takes the prize for its clarity, and I don't think it carries any extra overhead.

Answer 6

Tongue-in-cheek obviously:

var harshNum = 108;
"".split.call(harshNum,"").join("");

Or in ES6 you could simply use template strings:

var harshNum = 108;
`${harshNum}`;