Simple version of .Net Linq

pseudolinq.js

var  a = [ 1, 2, 3, 2 ];

console.log(PseudoLinq(a).select(function(i){ 
                return i + 1 
            }).toArray());

console.log(PseudoLinq(a).where(function(i){
                return i > 1
            }).select(function(i){ 
                return i - 1 
            }).toArray());


function PseudoLinq(data){
    if (Array.isArray(data)) {
        data = data.slice(0);
    } else {
        throw new Error("not implemented yet");
    }
    //private
    var _convertHashToArray = function(hash) {
        throw new Error("not implemented yet");
    }
    return {
        select: function(lambda){
            if (Array.isArray(data)) {
                for (var i = 0; i < data.length; i++) {
                    data[i] = lambda(data[i]);
                }
            } else {
                temp_data = [];
                for (var i in data) {
                    temp_data[i] = lambda({
                        key: i,
                        value: data[i]
                    })
                }
                data = temp_data;
            }
            return this;
        },
        where: function(lambda){
            if (Array.isArray(data)) {
                var result_data = [];
                for (var i = 0; i < data.length; i++) {
                    if (lambda(data[i]) === true) {
                        result_data.push(data[i]);
                    }
                }
                data = result_data;
            } else {
                throw new Error("not implemented yet");
            }
            return this;
        },
        toArray: function(){
            if (Array.isArray(data)) {
                return data;
            } else {
                return _convertHashToArray(data);
            }
        }
    }
}