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  • Book Overview & Buying Lo-Dash Essentials
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Lo-Dash Essentials

Lo-Dash Essentials

By : Adam Boduch
4.8 (8)
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Lo-Dash Essentials

Lo-Dash Essentials

4.8 (8)
By: Adam Boduch
Buy this Book

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.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Working with Arrays and Collections
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1. Working with Arrays and Collections
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The difference between arrays and collections
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Iterating over collections
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Sorting data
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Searching for data
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Slicing collections into smaller pieces
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Transforming collections
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Summary
2
2. Working with Objects
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2. Working with Objects
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Determining an object type
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Assigning and accessing properties
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Iterating over objects
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Calling methods
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Transforming objects
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Creating and cloning objects
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Summary
3
3. Working with Functions
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3. Working with Functions
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Binding function contexts
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Decorating functions
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Function constraints
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Timed execution
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Composing and currying functions
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Summary
4
4. Transformations Using Map/Reduce
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4. Transformations Using Map/Reduce
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Plucking values
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Mapping collections
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Mapping objects
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Reducing collections
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Reducing objects
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Binding contexts
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Map/reduce patterns
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Summary
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5. Assembling Chains
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5. Assembling Chains
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Creating Lo-Dash wrappers
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Building filters
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Testing truth conditions
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Counting items
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Transformations
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Intermediary results
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Keys and values
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Returning wrappers
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Summary
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6. Application Building Blocks
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6. Application Building Blocks
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Generic functions
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Generic wrappers and chains
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Composing functions
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Creating mixins
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Summary
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7. Using Lo-Dash with Other Libraries
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7. Using Lo-Dash with Other Libraries
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Modules
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jQuery
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Backbone
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Node.js
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Summary
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8. Internal Design and Performance
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8. Internal Design and Performance
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Design principles
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Improving performance
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Lazy evaluation
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Caching things
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Summary
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Index
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Index

Mapping objects

The previous section focused on collections and how to map them. But wait, objects are collections too, right? That is indeed correct, but it's worth differentiating between arrays and plain objects. The main reason is that there are implications with ordering and keys when performing map/reduce. At the end of the day, arrays and objects serve different use cases with map/reduce, and this chapter tries to acknowledge these differences.

Now we'll start looking at some techniques Lo-Dash programmers employ when working with objects and mapping them to collections. There are a number of factors to consider, such as the keys within an object, and calling methods on objects. We'll take a look at the relationship between key-value pairs and how they can be used in a mapping context.

Working with keys

We can use the keys of a given object in interesting ways to map the object to a new collection. For example, we can use the keys() function to extract the keys of an...

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Tech Concepts
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Programming languages
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