programming with javascript coursera week 2 quiz answers

Knowledge check: Arrays, Objects and Functions

1. What data type is the variable item ?

var item = [ ];

  • Boolean
  • Function
  • Array

2. What is the value of result for the following code?

var result = "Hello".indexOf('l');

  • 1
  • 2
  • 3
  • 4

3. What is the length of the clothes array after this code runs?

var clothes = [];
clothes.push('gray t-shirt');
clothes.push('green scarf');
clothes.pop();
clothes.push('slippers');
clothes.pop();
clothes.push('boots');
clothes.push('old jeans');

  • 1
  • 2
  • 3
  • 4

4. What value is printed out by the following code?

var food = [];
food.push('Chocolate');
food.push('Ice cream');
food.push('Donut');

console.log(food[1])

  • Chocolate
  • Ice cream

  • Donut

5. How many properties does the dog object have after the following code is run?

var dog = {
color: "brown",
height: 30,
length: 60
};
dog["type"] = "corgi";

  • 1
  • 2
  • 3
  • 4

6. In the following function, the variables a and b are known as _______________.

function add(a, b) {
return a + b;
}

  • Parameters
  • Return Values

7. Which of the following are functions of the Math object?

  • random()
  • round()
  • sqrt()
  • trim()

Knowledge check: Error handling

8. What will be printed when the following code runs?

var result = null;
console.log(result);

  • undefined
  • null
  • 0

9. When the following code runs, what will print out?

try {
console.log('Hello');
} catch(err) {
console.log('Goodbye');
}

  • Hello
  • Goodbye

10. If you pass an unsupported data type to a function, what error will be thrown?

  • RangeError
  • SyntaxErrror
  • TypeError

11. What will print out when the following code runs?

var x;

if(x === null) {
console.log("null");
} else if(x === undefined) {
console.log("undefined");
} else {
console.log("ok");
}

  • null
  • undefined
  • ok

12. What will print out when the following code runs?

throw new Error();
console.log("Hello");

  • Hello
  • Nothing will print out.

Module quiz: The Building Blocks of a Program

13. What data type is the variable x ?

var x = {};

  • Function
  • Array
  • Object

14. What will be the output of running the following code?

try {
console.log('hello)
} catch(e) {
console.log('caught')
}

  • Uncaught SyntaxError: Invalid or unexpected token.
  • Caught

15. What value is printed when the following code runs?

var burger = ["bun", "beef", "lettuce", "tomato sauce", "onion", "bun"]
console.log(burger[2]);

  • bun
  • beef
  • lettuce
  • tomato sauce
  • onion

16. In the following code, how many methods does the bicycle object have?

var bicycle = {
wheels: 2,
start: function() {
},
stop: function() {
}
};

  • 1
  • 2
  • 3

17. When the following code runs, what will print out?

try {
throw new Error();
console.log('Hello');
} catch(err) {
console.log('Goodbye');
}

  • Hello
  • Goodbye

18. If you mis-type some code in your JavaScript, what kind of error will that result in?

  • RangeError
  • SyntaxErrror
  • TypeError

19. Will the following code execute without an error?

function add(a, b) {
console.log(a + b)
}

add(3, "4");

  • Yes
  • No

20. What will be printed when the following code runs?

var result;
console.log(result);

  • undefined
  • null
  • 0

21. What will be the output of the following code?

var str = "Hello";
str.match("jello");

  • null
  • undefined
  • empty string

22. What will be the output of the following code?

try {
Number(5).toPrecision(300)
} catch(e) {
console.log("There was an error")
}

  • RangeError
  • 5
  • e
  • “There was an error”

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