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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
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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

Decorating functions

A decorator does what the name implies. It decorates functions with additional capabilities. It's like an adornment for a piece of functionality. For example, let's say we've already implemented a function that looks up data in some structure. It's already used throughout our application, but now we're implementing a new component that requires this same functionality and something extra. We can use the function-decorating tools provided by Lo-Dash to take existing functions and extend them.

There are two flavors of Lo-Dash function decoration: Partials, which construct new functions that have the arguments of the original function partially supplied, and Wrappers, which build a new function that wraps the original function with a whole new function.

Partials

To create a partial function using Lo-Dash, you use the partial() function. The resulting function then has some arguments presupplied—we don't have to supply them again when called. This concept is really useful...

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Tech Concepts
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Programming languages
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