unless

v0.9.6

STATUS

Passing

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VISIBILITY

Public

PUBLISHED

5 years ago

SIZE

922 B

Tests the final argument by passing it to the given predicate function.

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unless (

pred:Function,

whenFalseFn:Function,

x:*

) : *

Tests the final argument by passing it to the given predicate function. If the predicate is not satisfied, the function will return the result of calling the whenFalseFn function with the same argument. If the predicate is satisfied, the argument is returned as is.

Example

let safeInc = R.unless(R.isNil, R.inc);
     safeInc(null); //=> null
     safeInc(1); //=> 2

Arguments

pred: Function

A predicate function

whenFalseFn: Function

A function to invoke when the pred evaluates to a falsy value.

x: *

An object to test with the pred function and pass to whenFalseFn if necessary.

Returns

*

Either `x` or the result of applying `x` to `whenFalseFn`.