A sprintf-like function using d3,js

d3-sprintf.js

// A sprintf-like function using d3.js
// https://gist.github.com/2045912

function d3_sprintf(strings, formatters) {
  return formatters.reduce(function (strings, formatter, i) {
    strings[i] = formatter(strings[i]);
    return strings
  }, strings).join("");
};

d3_sprintf(
  ["This is PI to two digits: ", Math.PI, ", while this is PI to six digits: ", Math.PI], 
  [String, d3.format("2.2f"), String, d3.format("2.6f")]
);

// => "This is PI to two digits: 3.14, while this is PI to six digits: 3.141593"

d3_sprintf(
  ["Today is: ", new Date(), 
   ", but if you want to get all technical it's also: ", new Date(),
   ", which is the ", new Date(), "th week of the year."], 
  [String, d3.time.format("%Y-%m-%d"), String, d3.time.format.iso, String, d3.time.format("%W")]
);

// => "Today is: 2012-03-15, but if you want to get all technical it's also: 2012-03-15T19:29:39.673Z, which is the 11th week of the year."

d3_sprintf(
  ["Milliseconds since Jan 1, 1970 in exponential notation: ", Date.now(), 
   ", in SI units: ", Date.now()],
  [String, d3.format("1.3e"), String, d3.format("1.3s")]
);

// => "Milliseconds since Jan 1, 1970 in exponential notation: 1.332e+12, in SI units: 1.33T"