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add example for functions with ES6 default arguments #4

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1a92565
add example for functions with ES6 default arguments
May 21, 2018
a247ff0
Update README.md
May 21, 2018
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16 changes: 16 additions & 0 deletions README.md
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Expand Up @@ -119,6 +119,22 @@ handleResponse('some', 'args') // TypeError: Callback is required

Note the __vargs.strict__ call.

With ES6 default parameters:
vargs-callback uses Function.length to find the correct position for the callback. The length parameter only includes parameters before the first one with a default value so you will need to set the length parameter for functions with default arguments for vargs-callback to work.

```js
var vargs = require('vargs-callback')

function openTheDoor(door, options = {speed: 1} , callback) {
// actual function code using parameters
// options will be {speed: 1} if only door and callback given
if (door.isOpen) return
// ...
}

Object.defineProperty(openTheDoor, 'length', { value: 3 })
openTheDoor = vargs(openTheDoor) // Decorate global function
```

## The Rules

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