weird part 51 — functional programming

• create New value into new Array
• bind

var arr1 = [1,2,3];
function mapForEach(arr, fn){
    var newArr = [];
    for(var i = 0; i < arr.length; i++){
        newArr.push(
            fn(arr[i])//1,2,3
        )
    }
    return newArr;
}
function multiplyFn(index){
    return index * 2;
}
var arr2 = mapForEach(arr1, multiplyFn); 
var arr3 = mapForEach(arr2, function(index){
    return index < 3; 
});
console.log('first array -', arr1)
console.log('second array -', arr2) [2,4,6]
console.log('3 array -', arr3)[true,false,false]

#bind —copy of checkLimit function and argument(2)

var checkLimit = function(limiter, value){
    return value >= limiter;
    //return value === limiter? 1:0;
}
var arr4 = mapForEach(arr1, checkLimit.bind(this, 2));
console.log(arr4) // [true, false, false]

#simplify the function

var checkpastLimitSimplified = function(limiter){
    return function(limiter, value){
        return value > limiter;
    }.bind(this, limiter)
}
var arr5 = mapForEach(arr1, checkLimitSimplified(2))
console.log(arr5)