responses for codequiz http://www.codequizzes.com/topics/26/quizzes/85

exercise.js

What does the following expression return?
4 > 1;
true


What does the following expression return?
"chatty" === "chatty";
true


What does the following expression return?
3 <= 300
true


Print the string "I just ate a lot" to the console.
console.log("I just ate a lot");


if conditions will execute the code in the block if the boolean condition is true.  What does the following expression print to the console?
if (5 === 5) { console.log("This code is executed") };
This code is executed


What does the following expression print to the console?
if (5 > 10) { console.log("Not so sure about this") };
nothing is printed


What does the following expression print to the console?
if (5 > 10) {
  console.log("Not so sure about this");
} else {
  console.log("walking dead");
}
walking dead


What does the following expression print to the console?
if ("candy" === 8) {
  console.log("do something with your life");
} else if ("blah" === "blah") {
  console.log("just chill, have fun");
} else {
  console.log("people are strange");
}
just chill, have fun


What does the following expression print to the console?
if (5) { console.log("I like peanuts"); }
I like peanuts


What doe the following expression print to the console?
if ("") {
  console.log("program more");
} else if ("cool") {
  console.log("party hard!");
} else {
  console.log("blah");
}
party hard!


What does the following expression return?
!false
true


What does the following expression print to the console? 
if (!undefined) console.log("This syntax is weird…");
This syntax is weird…


What does the following code print to the console?
var counter = 0;
while (counter < 3) {
  console.log("The counter is at " + counter);
  counter++
}
The counter is at 0
The counter is at 1
The counter is at 2


What does the following code print to the console?
var result = 0;
for (var i = 0; i < 5; i++) {
  result += i;
}
console.log(result);
10


Arrays are ordered collections of elements.  What does the following code print to the console?
var my_array = [1, "bob"];
console.log(my_array[1]);
"bob"


What does the following code print to the console?
var q = "quack";
var num = 555666;
console.log([num, q, true]);
[555666, 'quack', true]


What does the following code print to the console?
["uno", "dos", "tres"].length;
3


Create an array with the following elements: "bob", 23, false.
["bob", 23, false];


Print the last element of my_array to the console.
var my_array = ["horse", "pig", "cow"];
console.log(my_array[2]);


What does the following code print to the console?
var writing_tools = ["pencil", "pen", "marker"];
console.log(writing_tools[writing_tools.length - 1]);
marker


What does the following code print to the console?
var b = [1, 2];
b[0] = "master p";
console.log(b);
["master p", 2];


What does the following code print to the console?
var numbers = [2, 4, 6, 8];
var counter = 0;
var sum = 0;
while (counter < numbers.length) {
  sum += numbers[counter];
  counter++;
}
console.log(sum);
20


What does the following code print to the console?
var words = ["teenage", "mutant", "ninja", "turtles"];
var great_show = "";
for (var i = 0; i < words.length; i++) {
  great_show += words[i] + " ";
}
console.log(great_show);
"teenage mutant ninja turtles"


What does the following statement return?
typeof(["cats"]);
object


What does the following statement return?
[1, 89] === [1, 89];
false


What does the following code return?
var blue = ["da ba dee da ba die"];
blue === blue;
true


Sum all the elements in the following array if they are numbers, otherwise ignore the element.  Print the result to the console.
var weird = [1, 40, "bob", [], false, 89];
var sum = 0;
for (var i = 0; i < weird.length; i++){
  if (typeof(weird[i]) == 'number'){
    sum = sum + weird[i];
  }
}
console.log(sum);


Update the "shots" element in the following array to be "don't do it".
var beverages = ["beer", "wine", "shots"];
beverages[2] = "don't do it"


What are the falsey values in JavaScript?  What does it mean when a value is falsey?
"", 0, false, undefined, null. they evaluate to false, but are not necessarily false


Concatenate all the elements in the following array that begin with the letter "b" and print the resulting sentence to the console.
var heaven = [34, [], "bodacious", "barbecues", "begin", "whatever", "by", "battering", true, "bacon"];
var str = "";
for (var i = 0; i < heaven.length; i++){
  if (heaven[i][0] == "b"){
    if (str.length == 0){
      str = heaven[i];
    } else {
      str += " " + heaven[i];
    }
  }
}
console.log(str);