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Address @i-am-tom and @shineli1984's review

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Steve Mao 2017-04-10 21:08:44 +10:00
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@ -698,7 +698,7 @@ pairToCoords(coordsToPair({x: 1, y: 2})) // {x: 1, y: 2}
### Catamorphism
A `reduceRight` function. Take a bunch of things, and combine them into another. The morphism is from "bunch of things" to "another".
A `reduceRight` function that applies a function against an accumulator and each value of the array (from right-to-left) to reduce it to a single value.
```js
const sum = xs => xs.reduceRight((acc, x) => acc + x, 0)
@ -734,17 +734,22 @@ The combination of anamorphism and catamorphism.
### Paramorphism
Enhancement of catamorphism. It's like `reduceRight`. However, there's a difference:
A function just like `reduceRight`. However, there's a difference:
In paramorphism, your reducer's arguments are the current value, the reduction of all previous values, and the list of values that formed that reduction.
```js
// Obviously not safe for lists containing `undefined`,
// but good enough to make the point.
const para = (reducer, accumulator, [x, ... xs]) =>
x !== undefined
? reducer(x, xs, para(reducer, accumulator, xs))
: accumulator
const para = (reducer, accumulator, elements) => {
if (elements.length === 0)
return accumulator
const head = elements[0]
const tail = elements.slice(1)
return reducer(head, tail, para(reducer, accumulator, tail))
}
const suffixes = list => para(
(x, xs, suffxs) => [xs, ... suffxs],