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var calculator = {

add : function(n1,n2){
 console.log(n1+n2); 
},
subtract :function(n1,n2){
  console.log(n1-n2);
},
multiplication : function(n1,n2){
  console.log(n1*n2);
},
division : function(n1,n2){
  console.log(n1/n2);
}
}  
 calculator.division(2,4); 
 calculator.add(2,4); 
 calculator.multiplication(2,4); 
 calculator.subtract(2,4); 
  
  
  
  /*function add(n1,n2) {
    return n1+n2;
  }

  function subtract(n1,n2) {
    return n1-n2;
  }
  function multiplication(n1,n2) {
    return n1*n2;
  }
  function division(n1,n2) {
    return n1/n2;
  }*/

function calculator(num1,num2,operation){
  switch(operation) {
    case 'add':
        var result = add(num1,num2);
        console.log(result);
        break;
    case 'subtract':
        var result = subtract(num1,num2);
        console.log(result);
        break;
    case 'multiplication':
        var result = multiplication(num1,num2);
        console.log(result);
        break;
    case 'division':
        var result = division(num1,num2);
        console.log(result);
        break;
    default:
      break;
  } 
  function add(n1,n2) {
    return n1+n2;
  }
  function subtract(n1,n2) {
    return n1-n2;
  }
  function multiplication(n1,n2) {
    return n1*n2;
  }
  function division(n1,n2) {
    return n1/n2;
  }
}
calculator(2,4,'add');
calculator(2,4,'subtract');
calculator(2,4,'multiplication');
calculator(2,4,'division');

function calculator(num1,num2,operation){
  switch(operation) {
    case 'add':
        console.log(add(num1,num2));
        break;
    case 'subtract':
        console.log(subtract(num1,num2));
        break;
    case 'multiplication':
        console.log(multiplication(num1,num2));
        break;
    case 'division':
        console.log(division(num1,num2));
        break;
    default:
      break;
  } 
  function add(n1,n2) {
    return n1+n2;
  }
  function subtract(n1,n2) {
    return n1-n2;
  }
  function multiplication(n1,n2) {
    return n1*n2;
  }
  function division(n1,n2) {
    return n1/n2;
  }
}
calculator(2,4,'add');
calculator(2,4,'subtract');
calculator(2,4,'multiplication');
calculator(2,4,'division');

function calculator(num1,num2,operation){
  switch(operation) {
    case 'add':
        console.log(add(num1,num2));
        break;
    case 'subtract':
        console.log(subtract(num1,num2));
        break;
    case 'multiplication':
        console.log(multiplication(num1,num2));
        break;
    case 'division':
        console.log(division(num1,num2));
        break;
    default:
      break;
  } 
  function add(n1,n2) {
    return n1+n2;
  }
  function subtract(n1,n2) {
    return n1-n2;
  }
  function multiplication(n1,n2) {
    return n1*n2;
  }
  function division(n1,n2) {
    return n1/n2;
  }
}
calculator(2,4,'add');
calculator(2,4,'subtract');
calculator(2,4,'multiplication');
calculator(2,4,'division');

function calculator(num1,num2,operation){
  switch(operation) {
    case 'add':
        add(num1,num2);
        break;
    case 'subtract':
        subtract(num1,num2);
        break;
    case 'multiplication':
        multiplication(num1,num2);
        break;
    case 'division':
        division(num1,num2);
        break;
    default:
      break;
  } 
  function add(n1,n2) {
    console.log(n1+n2);
  }
  function subtract(n1,n2) {
    console.log(n1-n2);
  }
  function multiplication(n1,n2) {
    console.log(n1*n2);
  }
  function division(n1,n2) {
    console.log(n1/n2);
  }
}
calculator(2,4,'add');
calculator(2,4,'subtract');
calculator(2,4,'multiplication');
calculator(2,4,'division');

function calculator(num1,num2,operation){
  switch(operation) {
    case 'add':
        console.log(num1 + num2);
        break;
    case 'subtract':
        console.log(num1 - num2);
        break;
    case 'multiplication':
        console.log(num1*num2);
        break;
    case 'division':
        console.log(num1 / num2);
        break;
    default:
      break;
  } 
}
calculator(2,4,'add');
calculator(2,4,'subtract');
calculator(2,4,'multiplication');
calculator(2,4,'division');

function calculator(num1,num2,operation){
  //add operation
  //if add, then add
  if(operation == 'add') {
    console.log(num1 + num2);
  } else if (operation == 'subtract') {
    console.log(num1 - num2);
  } else if (operation == 'multiplication') {
    console.log(num1*num2);
  } else if (operation == 'division') {
    console.log(num1 / num2);
  }
} 
  
calculator(2,4,'add');
calculator(2,4,'subtract');
calculator(2,4,'multiplication');
calculator(2,4,'division');

function calculator(num1,num2,operation){
  //add operation
  //if add, then add
  if(operation == 'add') {
    console.log(num1 + num2);
  } 
  
  //subtract operation
  if(operation == 'subtract') {
    console.log(num1 - num2);
  }
  //multiplication operation
  if(operation == 'multiplication') {
    console.log(num1*num2);
  }
  //division operation
  if(operation == 'division') {
    console.log(num1 / num2);
  }
  }
calculator(2,4,'add');
calculator(2,4,'subtract');
calculator(2,4,'multiplication');
calculator(2,4,'division');