Inject string values using JavaScript without RegEx?

Question

What is the easiest / most concise way to inject values into a string without using a RegEx expression or complex function?

For example, this:

var a = 'cats';
var b = 'dogs';

var result = String.format('%a and %b living together', a, b);
console.log(result);

... should yield ...

cats and dogs living together

I'm coming from the C# world where this is ridiculously easy. Every search on SO turns up some type of overcomplicated RegEx expression or replace function.

Answer 1

Template literals is probably the most concise (require ES6).

var result = `${a} and ${b} living together`;

On the other hand, regular string concatenation isn't that bad either.

var result = '' + a + ' and ' + b + ' living together';