4944503
Question 1
Question
Which of these is an object constructor?
Answer
-
function Bunny(type) { this.type = type; }
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var Bunny = {type: ""chocolate""};
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Bunny.create();
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Object.create(Bunny);
Question 2
Question
function Star() { // function body };
var andromeda = new Star();
How might you visually depict the prototype chain of `andromeda`?
Answer
-
andromeda --> Star.prototype --> Object.prototype --> null
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andromeda --> Star --> Function.prototype --> Object.prototype --> null
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andromeda --> Star.prototype -> Function.prototype --> Object.prototype --> null
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andromeda --> Star --> Object.prototype --> null
Question 3
Question
var numbers = [4, 84, 9, 7, 33];
numbers.length; // returns 5
numbers.length = 4;
Given the code above, what will `numbers.length` return?
Answer
-
4
-
5
-
undefined
-
null
Question 4
Question
x = ["y", "z"];
console.log(typeof x);
What prints to the console?
Answer
-
"object"
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"array"
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null
-
undefined
Question 5
Question
var myString = "This is a string!";
myString.length;
True or false: In this example, `length` is an own property on `myString`.
Answer
- True
- False
Question 6
Question
var protoFrog = { // some properties };
var greenFrog = Object.create(protoFrog);
How might you visually depict the prototype chain of `greenFrog`?
Answer
-
greenFrog --> protoFrog --> Object.prototype --> null
-
greenFrog --> protoFrog.prototype --> Object.prototype --> null
-
greenFrog --> Object.prototype --> null
-
none of these
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