JavaScript Template Literals

When you compose a string from multiple other strings and values in JavaScript, things can get ugly.

function logError(error, date) {
  console.log('Error: ' + error.message + ', ' + date.toString());

logError(new Error('Something went wrong!'), new Date());

This is already not pleasant with two values. It gets even worse as you introduce more.

ECMAScript 2015 introduced template literals, which can help make this sort of thing a bit more readable:

function logErrorTemplated(error, date) {
  console.log(`Error: ${error.message}, ${date.toString()}`);

logErrorTemplated(new Error('Something went wrong!'), new Date());

Pretty straightforward: A template literal uses backticks instead of quotes, and you can embed expressions into it using ${}.

You can also use newline characters in a template literal without having to insert \n.

console.log('Line one\nLine two');

…can become…

console.log(`Line one
Line two`);

…or if you prefer…

console.log(`Line one\nLine two`);

All three of these produce the same output.