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Welcome to the Basic Prep!
These free mini-courses will give you a strong foundation in web development. Track your progress and access advanced courses on HTML/CSS, Ruby and JavaScript for free inside our student portal.
Test Yourself: JavaScript Basics
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Some things you should know before moving on.
An Introduction to JavaScript
- How do you include JavaScript in your project?
- Why might you put your JavaScript includes at the bottom of the
<body>tag? - What is “JS Bin“?
- Where is the official JavaScript documentation located?
Basic Syntax: Types
- Are semicolons required?
- Are curly braces required?
- Are parentheses required for function invocation?
- What's the difference between using
var myVar = "foo";andmyVar = "foo";? - What's the difference between JS's
undefinedandnull? - Is
undefinedfalsy? - How do you make an alert box pop up?
- How do you write to the console?
- What can you put as keys in an Object in JavaScript?
- What can you put as values?
- What are two ways to get or set values to or from an object?
- In an object, is there a difference between using a plain text identifier like
myPropertyversus a string like"myProperty"? - How can you add or remove items to the front of an array?
- How can you add or remove items to the back of an array?
- How do you “cast” a String as a Number?
- How do you test the type of an object?
- What is the type of an Array?
- What's the difference between passing a function and invoking it?
- What are logical operators?
- What are comparison operators?
Basic Syntax: Looping
- What's the shortcut for incrementing an iterator like
i? - How do you stop the iteration?
- How do you jump to the next iteration?
Basic Syntax: Control Flow
- How do Ternary conditionals work in JavaScript?
- How do you invoke a function that's tucked inside of an object?
- What objects are falsy in JavaScript?
Basic Syntax: Arrays
- What are 2 ways to create an array?
- What is returned if you try to access an array index where nothing is stored?
- How do you combine arrays?
- How do you turn an array into a string?
- How do you sort an array?
- How do you compare two arrays?
- What does the
splicemethod do? - How is
forEachdifferent fromfor? - What does
mapdo? - What does
filterdo? - What does
reducedo?
Basic Syntax: Objects
- How do you define an object?
- What are two ways of accessing an object property?
- How do you add a new method to an object?
- What is going to be the value of
thiswhen called from an inside object method?
