where

v0.9.6

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5 years ago

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Takes a spec object and a test object; returns true if the test satisfies the spec.

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where (

spec:Object,

testObj:Object

) : Boolean

Takes a spec object and a test object; returns true if the test satisfies the spec. Each of the spec’s own properties must be a predicate function. Each predicate is applied to the value of the corresponding property of the test object. where returns true if all the predicates return true, false otherwise.

where is well suited to declaratively expressing constraints for other functions such as filter and find.

Example

// pred :: Object -> Boolean
     const pred = R.where({
       a: R.equals('foo'),
       b: R.complement(R.equals('bar')),
       x: R.gt(R.__, 10),
       y: R.lt(R.__, 20)
     });

     pred({a: 'foo', b: 'xxx', x: 11, y: 19}); //=> true
     pred({a: 'xxx', b: 'xxx', x: 11, y: 19}); //=> false
     pred({a: 'foo', b: 'bar', x: 11, y: 19}); //=> false
     pred({a: 'foo', b: 'xxx', x: 10, y: 19}); //=> false
     pred({a: 'foo', b: 'xxx', x: 11, y: 20}); //=> false

Arguments

spec: Object

testObj: Object

Returns

Boolean