snippetjavascriptCritical
JavaScript equivalent to printf/String.Format
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equivalentformatstringjavascriptprintf
Problem
I'm looking for a good JavaScript equivalent of the C/PHP
My basic requirement is a thousand separator format for numbers for now, but something that handles lots of combinations (including dates) would be good.
I realize Microsoft's Ajax library provides a version of
printf() or for C#/Java programmers, String.Format() (IFormatProvider for .NET).My basic requirement is a thousand separator format for numbers for now, but something that handles lots of combinations (including dates) would be good.
I realize Microsoft's Ajax library provides a version of
String.Format(), but we don't want the entire overhead of that framework.Solution
Current JavaScript
From ES6 on you could use template strings:
See Kim's answer below for details.
Older answer
Try sprintf() for JavaScript.
If you really want to do a simple format method on your own, don’t do the replacements successively but do them simultaneously.
Because most of the other proposals that are mentioned fail when a replace string of previous replacement does also contain a format sequence like this:
Normally you would expect the output to be
From ES6 on you could use template strings:
let soMany = 10;
console.log(`This is ${soMany} times easier!`);
// "This is 10 times easier!"See Kim's answer below for details.
Older answer
Try sprintf() for JavaScript.
If you really want to do a simple format method on your own, don’t do the replacements successively but do them simultaneously.
Because most of the other proposals that are mentioned fail when a replace string of previous replacement does also contain a format sequence like this:
"{0}{1}".format("{1}", "{0}")Normally you would expect the output to be
{1}{0} but the actual output is {1}{1}. So do a simultaneous replacement instead like in fearphage’s suggestion.Code Snippets
let soMany = 10;
console.log(`This is ${soMany} times easier!`);
// "This is 10 times easier!""{0}{1}".format("{1}", "{0}")Context
Stack Overflow Q#610406, score: 1662
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