sprintf equivalent for client-side JavaScript

Question

I know that console.log supports at least some of the basic features of printf from C through messing around, but I was curious of a way to take ad

Answer 1

Keep it simple

var sprintf = (str, ...argv) => !argv.length ? str : 
    sprintf(str = str.replace(sprintf.token||"$", argv.shift()), ...argv);

Since Javascript handles data types automatically, there is no need for type options.

If you need padding, "15".padStart(5,"0") = ("00000"+15).slice(-5) = "00015".

Usage

var sprintf = (str, ...argv) => !argv.length ? str : 
    sprintf(str = str.replace(sprintf.token||"$", argv.shift()), ...argv);

alert(sprintf("Success after $ clicks ($ seconds).", 15, 4.569));
sprintf.token = "_";
alert(sprintf("Failure after _ clicks (_ seconds).", 5, 1.569));

sprintf.token = "%";
var a = "%
%
%";
var b = sprintf("% plus % is %", 0, 1, 0 + 1);
var c = sprintf("Hello, %!", "world");
var d = sprintf("The answer to everything is %.", 42);
document.write(sprintf(a,b,c,d));