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In this course, you’ll start from the beginning and work your way up to more advanced concepts like type checking, iterators, and manipulating objects and arrays. You'll get a chance to get your hands dirty with plenty of real practice along the way.

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Learn TypeScript: The Complete Course for Beginners

## Function’s generic return type #

TypeScript, since **version 2.4**, can infer the type of a function's return value. Before **version 2.4**, `s.length` would give an error. The `s` was not from a `U[]` type but an empty object literal {}. 

# Function’s generic return type #

TypeScript, since **version 2.4**, can infer the type of a function's return value. Before **version 2.4**, `s.length` would give an error. The `s` was not from a `U[]` type but an empty object literal {}. 

In this lesson, you will cover the concept of the generic return type, optional parameter, and default value.

Introduction

The Basics of Variables

Comment

Enum

Generic Type

Functions

Mapped Type

Objects

Index Signature

Variables Advanced

Exception

Alias

Type Checking

Iterators

Manipulating Objects and Array

Sharing Code

Conclusion

Generic Return Type, Optional Parameter and Default Value

Function’s generic return type