Some good tasks for JS developers

tasks_JS.js

/* 
* Descriptions:
* Implement curry function.
*/

// Outputs:
function sum3(a, b, c){
  return a + b + c;
}
var sum3_curryed = curry(sum3);
sum3_curryed(1)(2)(3) // or sum3_curryed(1, 2)(3) of sum3_curryed(1)(2, 3)
// -> 6


/* 
* Descriptions:
* Implement myBind method without using bind, call, apply.
*/
// Outputs:
function getThis(){
  return this;
}
var a = 'Bind me';
getThis.myBind(a);
getThis();
// -> 'Bind me'


/* 
* Descriptions:
* Return true;
*/
function count(f) {
  return f() === 1
      && f()() === 2
      && f()()() === 3
      && f()()()() === 4
      && f()()()()() === 5
}


/* 
* Descriptions:
* Implement sum function.
*/
// Outputs:
sum(1)(2)() // -> 3
sum(0)(2)(3)(5)() // -> 10


/* 
* Descriptions:
* Implement myNew function.
*/
class Person {
  constructor(name) {
    this.name = name;
  }
  getName() {
    return this.name;
  }
}

const person = myNew(Person, "Vasia");
person.getName();