Default function parameters

The default function parameters in ES6, gives us the ability to initialize the function arguments with default values in case if they are undefined. For example,

function mult(a, b) {
  b = typeof b !== 'undefined' ?  b : 1;
  return a*b;
}
mult(5); // 5

function multiply(a, b = 1) {
  return a*b;
}
mult(5); // 5

Also Read:

1. Pure vs Impure functions
2. pseudo elements vs pseudo classes
3. Parse html response with fetch API
4. es6 iterators and iterables - creating custom iterators
5. Progressive enhancement vs Graceful degradation