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Lo-Dash Essentials

By : Adam Boduch

4.8 (8)

Lo-Dash Essentials

4.8 (8)

By: Adam Boduch

Overview of this book

If you are a curious JavaScript developer interested simultaneously in tweaking the efficiency of your code, as well as improving the conciseness of it, and maintaining the readability of it, then this is the book for you. Ideally, the book is intended for readers already working on JavaScript projects and using frameworks such as jQuery and Backbone. Even if you're already using Lo-Dash, this book will show you how to use it efficiently. While extensive JavaScript experience isn't a requirement, you should have at least some prior programming experience in order to best understand the concepts presented.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Working with Arrays and Collections

1. Working with Arrays and Collections

The difference between arrays and collections

Iterating over collections

Sorting data

Searching for data

Slicing collections into smaller pieces

Transforming collections

Summary

2. Working with Objects

2. Working with Objects

Determining an object type

Assigning and accessing properties

Iterating over objects

Calling methods

Transforming objects

Creating and cloning objects

Summary

3. Working with Functions

3. Working with Functions

Binding function contexts

Decorating functions

Function constraints

Timed execution

Composing and currying functions

Summary

4. Transformations Using Map/Reduce

4. Transformations Using Map/Reduce

Plucking values

Mapping collections

Mapping objects

Reducing collections

Reducing objects

Binding contexts

Map/reduce patterns

Summary

5. Assembling Chains

5. Assembling Chains

Creating Lo-Dash wrappers

Building filters

Testing truth conditions

Counting items

Transformations

Intermediary results

Keys and values

Returning wrappers

Summary

6. Application Building Blocks

6. Application Building Blocks

Generic functions

Generic wrappers and chains

Composing functions

Creating mixins

Summary

7. Using Lo-Dash with Other Libraries

7. Using Lo-Dash with Other Libraries

Modules

jQuery

Backbone

Node.js

Summary

8. Internal Design and Performance

8. Internal Design and Performance

Design principles

Improving performance

Lazy evaluation

Caching things

Summary

Index

Index

Chapter 3. Working with Functions

You'll find functions everywhere within a sufficiently large piece of JavaScript code. That's because they're treated in the same way as any other primitive type. Everything is an object in JavaScript, including functions. Functions have a context and a prototype, and they can be assigned to a new context and to variables.

Lo-Dash helps to best utilize functions. Where there are missing pieces, the utilities that Lo-Dash provides let us write some truly elegant, functional code. This chapter dives into these utilities. Whether we're changing the meaning of this or decorating an existing function, we'll walk through examples that illustrate how to get started.

In this chapter, we will cover the following topics:

Binding function contexts
Decorating functions
Function constraints
Timed execution
Composing and currying functions

Visually different images

CONTINUE READING

83

Tech Concepts

36

Programming languages

73

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