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30secondsofcode
2018-04-19 17:07:16 +00:00
parent d913e63644
commit 13769cce1f
13 changed files with 42 additions and 16 deletions
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7
snippets/when.md
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@ -5,14 +5,11 @@ Tests a value, `x`, against a predicate function. If `true`, return `fn(x)`. Els
Return a function expecting a single value, `x`, that returns the appropriate value based on `pred`.
```js
const when = (pred, whenTrue) => (x) => pred(x) ? whenTrue(x) : x;
const when = (pred, whenTrue) => x => (pred(x) ? whenTrue(x) : x);
```
```js
const doubleEvenNumbers = when(
(x) => x % 2 === 0,
(x) => x * 2
);
const doubleEvenNumbers = when(x => x % 2 === 0, x => x * 2);
doubleEvenNumbers(2); // 4
doubleEvenNumbers(1); // 1
```