constructN.js•1.85 kB
var _curry2 = require('./internal/_curry2');
var curry = require('./curry');
var nAry = require('./nAry');
/**
* 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.
*
* @func
* @memberOf R
* @since v0.4.0
* @category Function
* @sig Number -> (* -> {*}) -> (* -> {*})
* @param {Number} n The arity of the constructor function.
* @param {Function} Fn The constructor function to wrap.
* @return {Function} A wrapped, curried constructor function.
* @example
*
* // Variadic constructor function
* var Widget = () => {
* this.children = Array.prototype.slice.call(arguments);
* // ...
* };
* Widget.prototype = {
* // ...
* };
* var allConfigs = [
* // ...
* ];
* R.map(R.constructN(1, Widget), allConfigs); // a list of Widgets
*/
module.exports = _curry2(function constructN(n, Fn) {
if (n > 10) {
throw new Error('Constructor with greater than ten arguments');
}
if (n === 0) {
return function() { return new Fn(); };
}
return curry(nAry(n, function($0, $1, $2, $3, $4, $5, $6, $7, $8, $9) {
switch (arguments.length) {
case 1: return new Fn($0);
case 2: return new Fn($0, $1);
case 3: return new Fn($0, $1, $2);
case 4: return new Fn($0, $1, $2, $3);
case 5: return new Fn($0, $1, $2, $3, $4);
case 6: return new Fn($0, $1, $2, $3, $4, $5);
case 7: return new Fn($0, $1, $2, $3, $4, $5, $6);
case 8: return new Fn($0, $1, $2, $3, $4, $5, $6, $7);
case 9: return new Fn($0, $1, $2, $3, $4, $5, $6, $7, $8);
case 10: return new Fn($0, $1, $2, $3, $4, $5, $6, $7, $8, $9);
}
}));
});