Functional Programming: Object Composition

FE-Object-Composition.txt

// 1
```javascript
function sum(a) {
  return function(b) {
    return function(c) {
      return a + b + c;
    };
  };
}
```

// 2
```javascript
function sum(a) {
  return b => c => a + b + c;
}
sum(3)(4)(5);
```

// 3
```javascript
// in this case we stuck on 3 parameters
let add = (a, b, c) => a + b + c;
console.log(add(3, 4, 5));