mocoolka-function/lib/internal/arity.js

Function lib for function.

Object.defineProperty(exports, "__esModule", { value: true });
var create_1 = require("../create");
var getName_1 = require("../getName");
/**
 * Returns a new function which is equivalent to the given function,
 * except that the new function's length property is equal to given length.
 * This does not limit the function to using that number of arguments.
 * It's only effect is on the reported length.
 * @since v0.1.0
 * @keywords wrap
 * @param {number} length -The function parameter's number
 * @param {Function} fn - The function be wrap
 * @param {boolean} isNew - True register new Function
 * @return {Function} New function
 */
var arity = function (length, fn, isNew) {
    if (isNew === void 0) { isNew = false; }
    /* istanbul ignore next */
    length = length < 0 ? 0 : length;
    var parameters = new Array(length);
    for (var i = 0; i < length; ++i) {
        parameters[i] = 'a' + i;
    }
    var params = parameters.join();
    var code = isNew ? "return function (" + params + ") { return  new fn( " + params + "); };" :
        "return function (" + params + ") { return fn.apply(this, arguments); };";
    return create_1.default(getName_1.default(fn), ['fn'], code)(fn);
};
exports.default = arity;
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