sprintf.js

POSIX sprintf(3)-style String Formatting for JavaScript

Abstract

This is a JavaScript implementation of POSIX sprintf(3)-style string formatting for use in Node.js based server and browser based client environments.

Getting sprintf.js

You can conveniently get sprintf.js in various ways:

• Git: directly clone the official repository

  $ git clone https://github.com/rse/sprintfjs.git

• NPM: install as client component via the NPM package manager:

  $ npm install sprintfjs

• cURL: downloading only the main file from the repository

  $ curl -O https://raw.github.com/rse/sprintfjs/master/sprintf.js

API

The API is similar to POSIX sprintf(3). It is exposed via AMD and CommonJS under the module name sprintf and on the global window object in browser environments. The single exposed API method is (in TypeScript definition notation):

sprintf(fmt: String, ...arg: any[]): String;

It supports all standard POSIX sprintf(3) features like sprintf("%.2f", 12.3456) → 12.35 and sprintf("(%-6s)", "foo") → (foo ) plus (in addition to the usual positional arguments) two special argument referencing features:

• Indexed Arguments: sprintf("%2$s baz %3$s baz %1$s", "foo", "bar", "quux") → bar baz quux baz foo

• Named Arguments: sprintf("%(bar)s baz %(quux)s baz %(foo)s", { foo: "foo", bar: "bar", quux: "quux" }) → bar baz quux baz foo

See Also

sprintf(3)

License

Copyright (c) 2006-2021 Dr. Ralf S. Engelschall (http://engelschall.com/)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.