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Angelos Chalaris
2020-09-15 16:28:04 +03:00
parent 040efd4380
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snippets/unfold.md
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@ -5,8 +5,8 @@ tags: function,array,intermediate
Builds an array, using an iterator function and an initial seed value.
Use a `while` loop and `Array.prototype.push()` to call the function repeatedly until it returns `false`.
The iterator function accepts one argument (`seed`) and must always return an array with two elements ([`value`, `nextSeed`]) or `false` to terminate.
- Use a `while` loop and `Array.prototype.push()` to call the function repeatedly until it returns `false`.
- The iterator function accepts one argument (`seed`) and must always return an array with two elements ([`value`, `nextSeed`]) or `false` to terminate.
```js
const unfold = (fn, seed) => {
@ -20,4 +20,4 @@ const unfold = (fn, seed) => {
```js
var f = n => (n > 50 ? false : [-n, n + 10]);
unfold(f, 10); // [-10, -20, -30, -40, -50]
```
```