Learn
Let’s take one more glance at the concepts we just learned:
- Data is printed, or logged, to the console, a panel that displays messages, with
console.log()
. - We can write single-line comments with
//
and multi-line comments between/*
and*/
. - There are 7 fundamental data types in JavaScript: strings, numbers, booleans, null, undefined, symbol, and object.
- Numbers are any number without quotes:
23.8879
- Strings are characters wrapped in single or double quotes:
'Sample String'
- The built-in arithmetic operators include
+
,-
,*
,/
, and%
. - Objects, including instances of data types, can have properties, stored information. The properties are denoted with a
.
after the name of the object, for example:'Hello'.length
. - Objects, including instances of data types, can have methods which perform actions. Methods are called by appending the object or instance with a period, the method name, and parentheses. For example:
'hello'.toUpperCase()
. - We can access properties and methods by using the
.
, dot operator. - Built-in objects, including
Math
, are collections of methods and properties that JavaScript provides.
Here are a few more resources to add to your toolkit:
Make sure to bookmark these links so you have them at your disposal.
Take this course for free
By signing up for Codecademy, you agree to Codecademy's Terms of Service & Privacy Policy.