once

v0.9.6

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Passing

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Public

PUBLISHED

5 years ago

SIZE

860 B

Accepts a function `fn` and returns a function that guards invocation of

Function

Time

Utils

1 contributor

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once (

fn:Function

) : Function

Accepts a function fn and returns a function that guards invocation of fn such that fn can only ever be called once, no matter how many times the returned function is invoked. The first value calculated is returned in subsequent invocations.

Example

const addOneOnce = R.once(x => x + 1);
     addOneOnce(10); //=> 11
     addOneOnce(addOneOnce(50)); //=> 11

Argument

fn: Function

The function to wrap in a call-only-once wrapper.

Returns

Function

The wrapped function.