cond

v0.9.6

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Passing

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PUBLISHED

5 years ago

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3 KB

Returns a function, `fn`, which encapsulates `if/else, if/else, ...` logic.

Function

Utils

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cond (

pairs:Array

) : Function

Returns a function, fn, which encapsulates if/else, if/else, ... logic. R.cond takes a list of [predicate, transformer] pairs. All of the arguments to fn are applied to each of the predicates in turn until one returns a “truthy” value, at which point fn returns the result of applying its arguments to the corresponding transformer. If none of the predicates matches, fn returns undefined.

Example

const fn = R.cond([
       [R.equals(0),   R.always('water freezes at 0°C')],
       [R.equals(100), R.always('water boils at 100°C')],
       [R.T,           temp => 'nothing special happens at ' + temp + '°C']
     ]);
     fn(0); //=> 'water freezes at 0°C'
     fn(50); //=> 'nothing special happens at 50°C'
     fn(100); //=> 'water boils at 100°C'

Argument

pairs: Array

A list of [predicate, transformer]

Returns

Function