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How Can I Achieve printf/String.Format Functionality for Number Formatting in JavaScript?
How Can I Achieve printf/String.Format Functionality for Number Formatting in JavaScript?
Dec 27, 2024 pm 02:34 PM
JavaScript Analogue of printf/String.Format
You seek a JavaScript equivalent to C/PHP printf() or C#/Java String.Format() specifically for number formatting with thousand separators. The Microsoft Ajax library provides String.Format(), but you prefer a lightweight solution.
Current JavaScript
ES6 introduces template strings, offering a concise alternative:
let soMany = 10;
console.log(`This is ${soMany} times easier!`);
// "This is 10 times easier!"
Older Solutions
Consider the sprintf() library for JavaScript. Alternatively, implement your own simplified format method as follows:
function format(template, ...args) {
return template.replace(/{(\d+)}/g, (match, index) => args[index]);
}
This approach avoids successive replacements that can lead to errors when replacement strings contain format sequences.
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