Learn TypeScript 3 by Building Web Applications

Basic TypeScript types

Before we go on, let's see what basic types are supported by TypeScript:

• boolean: true or false.
• number: Floating point values. Those can be expressed in hexadecimal, decimal, binary, and octal forms.
• string: can be delimited by single quotes ('), double quotes ("), or back-ticks (`) to define template literals (also known as template strings).

Here are some examples of numbers:

• let decimal: number = 42
• let hexadecimal: number = 0x42
• let binary: number = 0b101010
• let octal: number = 0o52

Here are some string examples:

• let hello: string = 'Hello'
• let world: string = "World" // same as above
• let cool: string = `${hello} ${world}!`

Template strings are very useful—they make it really easy to embed expressions. In ...