functional programming

monad example

let add = (val, fun) => fun(val + 3);
let multiplication = (val) => val * 3; 

console.log(add(2, multiplication));
//--------------------------------
let test = {
      a: 10,
      b: 20,
      c: 30
    };

let loopMap = (obj) => {
    let o = {};
    for (let prop in obj) {
        o[prop] = obj[prop] + 10;
    }
    return o;
};

console.log('loopMap', loopMap(test));

//----------------------------------

let loopMap2 = (obj, fun) => {
    let o = {};
    for (let prop in obj) {
        o[prop] = fun(obj[prop]);
    }
    return o;
};

let monad = {
      plus(val) {
        return val + 20;
      },
      multiplied(val) {
        return val * 2;
      }
};
console.log('plus', loopMap2(test, monad.plus));
console.log('multiplied', loopMap2(test, monad.multiplied));