@putout/plugin-maybe [![NPM version][NPMIMGURL]][NPMURL]

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[NPMURL]: https://npmjs.org/package/@putout/plugin-maybe "npm"

🐊Putout plugin helps with maybe monad.

Install

``
npm i @putout/plugin-maybe -D
`

Rules

- ✅ array;
- ✅ empty-array;
- ✅ fn;
- ✅ noop;
- ✅ declare;

Config

`json
{
"rules": {
"maybe/array": "on",
"maybe/empty-array": "on",
"maybe/fn": "on",
"maybe/noop": "on",
"maybe/declare": "on"
}
}
`

array

$3

`js
const {isArray} = Array;
const array = isArray(a) ? a : [a];
`

$3

`js
const {isArray} = Array;
const maybeArray = (a) => isArray(a) ? a : [a];
const array = maybeArray(a);
`

empty-array

$3

`js
const array = !a ? [] : a;
`

$3

`js
const maybeArray = (a) => !a ? [] : a;
const array = maybeEmptyArray(a);
`

fn

$3

`js
const isFn = (a) => typeof a === 'function';
const fn = isFn(a) ? a : () => {};
`

$3

`js
const isFn = (a) => typeof a === 'function';
const noop = () => {};
const maybeFn = isFn(a) ? a : noop;
const fn = maybeFn(a);
`

noop

$3

`js
const fn = f || (() => {});
`

$3

`js
const noop = () => {};
const fn = fn || noop;
`

declare

$3

When you not sure is f a function, but you want to use it as function anyways:

`js
const fn = maybeFn(f);

maybeCall(fn);
`

$3

`js
const isFn = (a) => typeof a === 'function';
const noop = () => {};
const maybeFn = (a) => isFn(a) ? a : noop;
const maybeCall = (a, ...b) => isFn(a) && a(...b);

const fn = maybeFn(f);
maybeCall(fn);
`

When you not sure is a is an array or not, but you want to get first element of it.

$3

`js
const b = maybeFirst(a);
`

$3

`js
const {isArray} = Array;
const maybeFirst = (a) => isArray(a) ? a[0] : a;

const b = maybeFirst(a);
``

License

MIT