construct

v0.9.6

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Passing

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PUBLISHED

5 years ago

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1 KB

Wraps a constructor function inside a curried function that can be called with the same arguments and returns the same type.

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construct (

fn:Function

) : Function

Wraps a constructor function inside a curried function that can be called with the same arguments and returns the same type.

Example

// Constructor function
     function Animal(kind) {
       this.kind = kind;
     };
     Animal.prototype.sighting = function() {
       return "It's a " + this.kind + "!";
     }

     const AnimalConstructor = R.construct(Animal)

     // Notice we no longer need the 'new' keyword:
     AnimalConstructor('Pig'); //=> {"kind": "Pig", "sighting": function (){...}};

     const animalTypes = ["Lion", "Tiger", "Bear"];
     const animalSighting = R.invoker(0, 'sighting');
     const sightNewAnimal = R.compose(animalSighting, AnimalConstructor);
     R.map(sightNewAnimal, animalTypes); //=> ["It's a Lion!", "It's a Tiger!", "It's a Bear!"]

Argument

fn: Function

The constructor function to wrap.

Returns

Function

A wrapped, curried constructor function.