foop
Version:
interfaces that describe their intentions.
102 lines (97 loc) • 10 kB
JavaScript
/* eslint max-len: "OFF" */
/* eslint consistent-return: "OFF" */
var isNumberPrimitive = require('../is/numberPrimitive')
var curry = require('./curry')
// const nAry = require('./arity')
/**
* 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.
*
* @memberOf fp
* @symb 👷
* @since 5.0.0-beta.4
*
* @param {number} n The arity of the constructor function. (aka, number of args)
* @param {Function} Klass The constructor function to wrap. (class to do `new Klass` on)
* @return {Function} A wrapped, curried constructor function.
*
* @func
* @fork v0.4.0
* @category Function
* @sig Number -> (* -> {*}) -> (* -> {*})
*
* @extends R.construct
* @extends R.constructN
* @variation with a single *notNumber* arg, it acts as construct, rather than constructN
*
* {@link https://stackoverflow.com/questions/9267157/why-is-it-impossible-to-change-constructor-function-from-prototype stack-overflow-constructor}
* {@link https://github.com/ramda/ramda/blob/master/src/constructN.js ramda-construct}
* @see {@link ramda-construct}
* @see {@link stack-overflow-constructor}
* @see isNumberPrimitive
*
* @example
*
* // Variadic Constructor function
* function Salad() {
* this.ingredients = arguments;
* }
*
* Salad.prototype.recipe = function() {
* var instructions = R.map(ingredient => 'Add a dollop of ' + ingredient, this.ingredients);
* return R.join('\n', instructions);
* };
*
* var ThreeLayerSalad = R.constructN(3, Salad);
*
* // Notice we no longer need the 'new' keyword, and the constructor is curried for 3 arguments.
* var 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
*
*/
function constructN(n, Klass) {
var this$1 = this;
if (!isNumberPrimitive(n)) {
return constructN(n.length, n)
}
else if (n === 0) {
/**
* @HACK @FIXME @TODO shows incorrect arity,
* but if we want not-specific constructs...
*/
return function (...args) {
if (args.length !== 0) {
return constructN(args.length, Klass).apply(this$1, args)
}
else {
return new Klass()
}
}
}
else {
/*, $5, $6, $7, $8, $9 */
// curry(nAry(n,
return curry(n, function($0, $1, $2, $3, $4) {
var len = arguments.length
if (len === 1 || len > 5) { return new Klass($0, $1, $2) }
else if (len === 2) { return new Klass($0, $1) }
else if (len === 3) { return new Klass($0, $1, $2) }
else if (len === 4) { return new Klass($0, $1, $2, $3) }
else if (len === 5) { return new Klass($0, $1, $2, $3, $4) }
// else if (len=== 6) return new Klass($0, $1, $2, $3, $4, $5)
// else if (len=== 7) return new Klass($0, $1, $2, $3, $4, $5, $6)
// else if (len=== 8) return new Klass($0, $1, $2, $3, $4, $5, $6, $7)
// else if (len=== 9) return new Klass($0, $1, $2, $3, $4, $5, $6, $7, $8)
// else if (len === 10) return new Klass($0, $1, $2, $3, $4, $5, $6, $7, $8, $9)
})
// ))
}
}
// module.exports = curry(2, constructN)
module.exports = constructN
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