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Updated unfold and range methods for significant performance improvement (see notes) #7

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Updated unfold and range methods for significant performance improvement (see notes) #7

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a5cbd32
Updated unfold and range methods (see notes)
richardeschloss Dec 27, 2019
e404b17
Removed array destructuring. Array elms passed by ref.
richardeschloss Jan 13, 2020
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18 changes: 10 additions & 8 deletions readme.md
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Original file line number Diff line number Diff line change
Expand Up @@ -285,11 +285,13 @@ const para = (f, acc, xs) =>

```js
const unfold = (f, seed) => {
const go = (f, seed, acc) => {
const res = f(seed);
return res ? go(f, res[1], acc.concat([res[0]])) : acc;
const next = (f, val, acc) => {
if (!f(val)) return acc
const resVal = f(val);
acc.push(resVal[0])
return next(f, resVal[1], acc);
}
return go(f, seed, [])
return next(f, seed, [])
}
unfold(x =>
x < 26
Expand All @@ -304,11 +306,11 @@ unfold(x =>
### Range

```js
const range = (i, count) =>
unfold(x => (x <= count)
? [x, x+1]
const range = (start, end) =>
unfold(val => (val <= end)
? [val, val + 1]
: null
, i);
, start);
range(5, 10)
//=> [ 5, 6, 7, 8, 9, 10 ]
```
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