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Added definition for predicate. #54

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Jul 15, 2016
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Added definition for predicate. #54

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8 changes: 8 additions & 0 deletions readme.md
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Expand Up @@ -17,6 +17,7 @@ Where applicable, this document uses terms defined in the [Fantasy Land spec](ht
* [Side effects](#side-effects)
* [Idempotent](#idempotent)
* [Point-Free Style](#point-free-style)
* [Predicate](#predicate)
* [Contracts](#contracts)
* [Guarded Functions](#guarded-functions)
* [Categories](#categories)
Expand Down Expand Up @@ -197,7 +198,14 @@ let incrementAll2 = map(add(1));

Points-free function definitions look just like normal assignments without `function` or `=>`.

## Predicate
A predicate is a function that returns true or false for a given value. A common use of a predicate is as the callback for array filter.

```js
const predicate = (a) => a > 2;

[1, 2, 3, 4].filter(predicate); // [3, 4]
```

## Contracts

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