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Contents?: true
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Contents
//
// vargs.js
//
// variable argument handling for functions taking a callback
//
// usage:
//
// var Args = new("vargs").Constructor;
//
// function (/* [arg1, arg2, ...][,callback] */) {
// var args = new(Args)(arguments);
//
// args.first; // first argument
// args.last; // last argument before callback
// args.callback; // callback argument, or an empty function
// args.all; // all arguments except callback
// args.length; // number of arguments, not including callback
//
// args.callbackGiven() // returns true or false
// args.at(-1) // last argument, including callback
// args.array // all arguments, including callback
// }
//
exports.Constructor = function Vargs(arguments) {
this.array = Array.prototype.slice.call(arguments);
this.__defineGetter__('length', function () {
if (this.callbackGiven()) {
return this.array.length - 1;
} else {
return this.array.length;
}
});
this.__defineGetter__('all', function () {
if (this.callbackGiven()) {
return this.array.slice(0, -1);
} else {
return this.array;
}
});
this.__defineGetter__('last', function () {
if (typeof(this.at(-1)) === 'function') {
return this.at(-2);
} else {
return this.at(-1);
}
});
this.__defineGetter__('first', function () {
return this.array[0];
});
this.callback = this.callbackGiven() ? this.at(-1)
: function () {};
};
exports.Constructor.prototype = {
callbackGiven: function () {
return typeof(this.at(-1)) === 'function';
},
at: function (n) {
if (n < 0) {
return this.array[this.array.length + n];
} else {
return this.array[n];
}
}
};
exports.Constructor.last = function (args) {
return args[args.length - 1];
};
Version data entries
26 entries across 26 versions & 1 rubygems