construct-n

v0.9.6

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5 years ago

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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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constructN (

n:Number,

Fn:Function

) : Function

Wraps a constructor function inside a curried function that can be called with the same arguments and returns the same type. The arity of the function returned is specified to allow using variadic constructor functions.

Example

// Variadic Constructor function
     function Salad() {
       this.ingredients = arguments;
     }

     Salad.prototype.recipe = function() {
       const instructions = R.map(ingredient => 'Add a dollop of ' + ingredient, this.ingredients);
       return R.join('\n', instructions);
     };

     const ThreeLayerSalad = R.constructN(3, Salad);

     // Notice we no longer need the 'new' keyword, and the constructor is curried for 3 arguments.
     const salad = ThreeLayerSalad('Mayonnaise')('Potato Chips')('Ketchup');

     console.log(salad.recipe());
     // Add a dollop of Mayonnaise
     // Add a dollop of Potato Chips
     // Add a dollop of Ketchup

Arguments

n: Number

The arity of the constructor function.

Fn: Function

The constructor function to wrap.

Returns

Function

A wrapped, curried constructor function.