Question

I’ve just created a small js framework like underscoer.js. The method calls are carried out by mc_.grep([1,2,3,4], function(val){ return val > 2; });. How can I make it more like jQuery style mc_(var).grep(func..).map(func..); ? Any ideas? And also how can I make the library better?

https://github.com/awesomegamer/mc_-js-library

Answer 1

// Your function should return a wrapped object
function Wrap(list) {
    return Object.create(Wrap).constructor(list)
}

// set the list as an internal property
Wrap.constructor = function (list) {
    this._list = list
    return this
}

// map function works in one of two ways, if it has an internal _list property
// then it was called as Wrap(list).map(...)
// then call the map function on it with the arguments
// store the result as a new list as _list
// return this so you can chain
//
// If it's not then it was used as Wrap.map(list, ...)
// extract the arguments using [].slice(arguments, 1)
// then return the result of invoking it
Wrap.map = function (list) {
    if (this._list) {
        this._list = this._list.map.apply(this._list, arguments)
        return this
    } else {
        return list.map.apply(list, [].slice.call(arguments, 1))
    }
}

// Wrappers need an unwrap method
// Wrap(list).map(...).filter(...).reduce(...).get()
Wrap.get = function () { 
    return this._list
}