ES6 Spread Operator

One of my favorite feature of ES6 is the spread operator that is represented by .... It is comparable in Ruby to the splat operator *.

I use this feature all the time in my code, it really simplify the code readability by removing repetition.

You can use it to merge array:

// javascript
const previousArray = [3, 4];
const array = [1, 2, ...previousArray]; // => [1, 2, 3, 4];

# ruby
array = [1, 2]
newArray = [*array, 3, 4] # => [1, 2, 3, 4];

Call a function that can get an unknown number of arguments:

// javascript
function foo(...args) {
  console.log(args.length) // => 3
}

foo('a', 'b', 'c');

# ruby
def foo(*args)
  puts args.size # => 3
end

foo('a', 'b', 'c');

Here is an example of refactoring by using the spread operator for the Timeshift library:

Here is a link to the commit.