Some JavaScript questions.

interview.js

/* jshint ignore:start */

// Complete the questions below and save the file as first-last.js

// Question 1.

// Looking at the loop below, we expect the output to be 0 through 4. However,
// the loop below will output the value "5" five times. Fix it.

for (var i = 0; i < 5; ++i) {
  setTimeout(function () {
    console.log(i);
  }, i * 500);
}

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


// Question 2.

// What is the result of envoking the function log? Why?

log('Hello!');

var log = function (output) {
  console.log(output);
}

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


// Question 3.

(function () {
  "use strict";

  // Is the assignment below valid in this functions scope?
  // Explain.

  name = 'Fuzzy Matter';
});

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


// Question 4.

function op(operator, num1, num2) {
  switch (operator) {
    case '*':
      return num1 * num2;

    case '/':
      return num1 / num2;

    case '-':
      return num1 - num2;

    case '+':
      return num1 + num2;

    default:
      console.warn('unknown operator');
      return undefined;

  }
}

// Given the function op(), use function binding to create a function
// multiply() that automatically passes the string "*" and gives the correct
// result.
// For example, console.log(multiply(2,2)); should output 4.

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


// Question 5.

// Which of the 2 function statements is affected by hoisting?
var fn1 = function () { };
function fn2 () { }

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


// Question 6.

var data = [1, 2, 3, 4];

// Why is using delete with arrays bad practice?
// What is the length of the data array at this point?
delete data[1];

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

// Question 7.

function Person (first, last) {
  this.first = first || '';
  this.last = last || '';
}

// Given the Person constructor above, create a method name() that simply
// returns first + ' ' + last, but is shared by all instances of Person.

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