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New points-free example and discussion

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Scott Sauyet 2015-09-21 21:26:45 -04:00
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@ -119,14 +119,27 @@ executions with the the same input parameters.
--- ---
## Point Free ## Points-Free
> A function whose definition does not include information regarding its arguments. > A function whose definition does not include information regarding its arguments.
```js ```js
let abs = Math.abs // Given
let combine = curry((fn, initialVal, list) => list.reduce(fn, initialVal));
let add = (a, b) => a + b;
// Then
// Not points-free
let total1 = (numbers) => combine(add, 0, numbers);
// Points-free
let total2 = combine(add, 0);
``` ```
`total1` lists and uses the parameter `numbers`, so it is not points-free. `total2` is written just by combining functions and values, making no mention of its arguments. It _is_ points-free.
It is easy to recognize points-free function definitions; they are the ones that contain no '`function`' keywords and no fat arrows.
--- ---
## Contracts ## Contracts