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

Shuffle Q/A 1

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
Next

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