we want to write calculations using functions and get the results. example: seven(times(five())); // must return 35

calculate-with-function-names.js

/**
Developer comments
- we want to write calculations using functions and get the results. example: seven(times(five())); // must return 35
- use return to understand the structure those functinos are being called
- use array to pass and store all previous data of those functions
- build single function to resolve the array we build
**/
function resolve(a) {
  if(a.length >= 3) {
    if(a[1] === '*') {
      res = parseInt(a[2], 10) * parseInt(a[0], 10)
    }
    
    if(a[1] === '/') {
      res = parseInt(a[2], 10) / parseInt(a[0], 10)
    }
    
    if(a[1] === '-') {
      res = parseInt(a[2], 10) - parseInt(a[0], 10)
    }
    
    if(a[1] === '+') {
      res = parseInt(a[2], 10) + parseInt(a[0], 10)
    }

    return Math.floor(res);
  }
  
  return a
}

function zero(a = []) {
  a.push('0');

  return resolve(a);
}
function one(a = []) {
  a.push('1');
  return resolve(a);
}
function two(a = []) {
  a.push('2');
  return resolve(a);
}
function three(a = []) {
  a.push('3');
  return resolve(a);
}
function four(a = []) {
  a.push('4');
  return resolve(a);
}
function five(a = []) {
  a.push('5');
  return resolve(a);
}
function six(a = []) {
  a.push('6');
  return resolve(a);
}
function seven(a = []) {
  a.push('7');
  return resolve(a);
}
function eight(a = []) {
  a.push('8');
  return resolve(a);
}
function nine(a = []) {
  a.push('9');
  return resolve(a);
}

function plus(a = []) {
  a.push('+');
  return resolve(a);
}
function minus(a = []) {
  a.push('-');
  return resolve(a);
}
function times(a = []) {
  a.push('*');
  return a;
}
function dividedBy(a = []) {
  a.push('/');
  return resolve(a);
}