Lodash 4 Cookbook
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Lodash 4 Cookbook

For lodash 4.17.21

About the Book

In modern web development, JavaScript is a must-to-learn programming language. Using JavaScript is not an easy task. Most of JavaScript APIs are low-level APIs, which are hard to learn and use. Lodash is a popular JavaScript utility framework. It provides a lot of high-level APIs which are more convenient to remember and use. Developers can dramatically increase productivity by using lodash.

This book is a very good start point to learn lodash 4 and apply it in practice. It covers core concepts and functions provided by lodash with real examples. For some complicated functions, e.g. functions related to functional programming, this book has a more detailed explanation.

Most of the code examples are written as Jest test cases with ES6.

Lodash is no longer updating, so there won't be further updates to this book.

About the Author

Fu Cheng
Fu Cheng

Full-stack software developer and content creator.

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Table of Contents

  • 1. Introduction
    • 1.1 Installation
      • 1.1.1 Web
      • 1.1.2 NodeJS
    • 1.2 Lodash features
    • 1.3 Code sample convention
    • 1.4 About this book
  • 2. Common concepts
    • 2.1 Truthy and falsy
    • 2.2 SameValueZero
    • 2.3 Predicates
      • 2.3.1 matches
      • 2.3.2 matchesProperty
      • 2.3.3 property
    • 2.4 Iteratees
      • 2.4.1 Iteratee shorthand
    • 2.5 this binding
  • 3. Collections
    • 3.1 Each
    • 3.2 Every and some
    • 3.3 Filter and reject
    • 3.4 Size
    • 3.5 Includes
    • 3.6 Sample
    • 3.7 Shuffle
    • 3.8 Partition
    • 3.9 Count by
    • 3.10 Group by and key by
    • 3.11 invokeMap
    • 3.12 Map and reduce
      • 3.12.1 Map
      • 3.12.2 Reduce
    • 3.13 Search
      • 3.13.1 find
      • 3.13.2 findLast
    • 3.14 Sort
    • 3.15 flatMap
  • 4. Arrays
    • 4.1 Search
    • 4.2 Set operations
      • 4.2.1 Equality comparisons
      • 4.2.2 Unique
      • 4.2.3 Union
      • 4.2.4 Difference
      • 4.2.5 Intersection
      • 4.2.6 Symmetric difference
    • 4.3 Chunk
    • 4.4 Compact
    • 4.5 Fill
    • 4.6 Flatten
    • 4.7 Remove
      • 4.7.1 remove
      • 4.7.2 pull
      • 4.7.3 pullAt
      • 4.7.4 pullAll
      • 4.7.5 without
    • 4.8 Zip
      • 4.8.1 zip
      • 4.8.2 zipWith
      • 4.8.3 zipObject
      • 4.8.4 zipObjectDeep
      • 4.8.5 unzip
    • 4.9 Partition
      • 4.9.1 first
      • 4.9.2 last
      • 4.9.3 initial
      • 4.9.4 tail
    • 4.10 Slicing
      • 4.10.1 Basic slicing
      • 4.10.2 Drop elements
      • 4.10.3 Take elements
    • 4.11 Sorted arrays
    • 4.12 Concatenation
    • 4.13 From pairs
    • 4.14 Join
    • 4.15 Reverse
    • 4.16 Nth element
  • 5. Objects
    • 5.1 Assign
      • 5.1.1 assign
      • 5.1.2 assignIn
      • 5.1.3 assignInWith
    • 5.2 Merge
      • 5.2.1 merge
      • 5.2.2 mergeWith
    • 5.3 Transform
    • 5.4 Create
    • 5.5 Default values
    • 5.6 Function names
      • 5.6.1 functions
      • 5.6.2 functionsIn
    • 5.7 Invert
      • 5.7.1 invert
      • 5.7.2 invertBy
    • 5.8 Keys and values
      • 5.8.1 has
      • 5.8.2 hasIn
      • 5.8.3 keys and keysIn
      • 5.8.4 values and valuesIn
      • 5.8.5 mapValues
      • 5.8.6 mapKeys
      • 5.8.7 result
      • 5.8.8 toPairs and toPairsIn
    • 5.9 Pick and omit
      • 5.9.1 pick and pickBy
      • 5.9.2 omit and omitBy
    • 5.10 Iterate
      • 5.10.1 forIn and forInRight
      • 5.10.2 forOwn and forOwnRight
    • 5.11 Get and set
      • 5.11.1 get
      • 5.11.2 set
      • 5.11.3 setWith
      • 5.11.4 update
    • 5.12 At
    • 5.13 Find key
  • 6. Functions
    • 6.1 Bind
    • 6.2 Before and after
      • 6.2.1 before
      • 6.2.2 after
    • 6.3 Ary
    • 6.4 Partial
      • 6.4.1 partial
      • 6.4.2 partialRight
    • 6.5 Curry
    • 6.6 Flow
    • 6.7 Defer
    • 6.8 Once
    • 6.9 Negate
    • 6.10 Spread
    • 6.11 Wrap
    • 6.12 Rearg
    • 6.13 Rest parameters
    • 6.14 Debounce and throttle
      • 6.14.1 Debounce
      • 6.14.2 Throttle
    • 6.15 Memoize
    • 6.16 Modify arguments
    • 6.17 Flip arguments
  • 7. Strings
    • 7.1 Character cases
      • 7.1.1 capitalize
      • 7.1.2 camelCase
      • 7.1.3 snakeCase
      • 7.1.4 kebabCase
      • 7.1.5 startCase
    • 7.2 Search
    • 7.3 Escape
    • 7.4 Pad
    • 7.5 Trim
    • 7.6 Repeat
    • 7.7 Truncate
    • 7.8 parseInt
    • 7.9 Words
    • 7.10 Replace
    • 7.11 Split
    • 7.12 Uppercase and lowercase
      • 7.12.1 upperCase
      • 7.12.2 upperFirst
      • 7.12.3 toUpper
      • 7.12.4 lowerCase
      • 7.12.5 lowerFirst
      • 7.12.6 toLower
  • 8. Miscellaneous
    • 8.1 Types
      • 8.1.1 Type check
      • 8.1.2 Type conversion
    • 8.2 Clone
    • 8.3 Date
    • 8.4 Math
      • 8.4.1 Add
      • 8.4.2 Subtract
      • 8.4.3 Multiply
      • 8.4.4 Divide
      • 8.4.5 Max
      • 8.4.6 Min
      • 8.4.7 Sum
      • 8.4.8 Ceil
      • 8.4.9 Floor
      • 8.4.10 Round
      • 8.4.11 Mean
    • 8.5 Number
      • 8.5.1 inRange
      • 8.5.2 clamp
      • 8.5.3 Random numbers
    • 8.6 Comparison
      • 8.6.1 isEqual and isEqualWith
      • 8.6.2 eq
      • 8.6.3 gt and gte
    • 8.7 Utilities
      • 8.7.1 attempt
      • 8.7.2 constant
      • 8.7.3 identity
      • 8.7.4 noop
      • 8.7.5 noConflict
      • 8.7.6 Range
      • 8.7.7 times
      • 8.7.8 uniqueId
      • 8.7.9 Method
      • 8.7.10 cond
      • 8.7.11 conforms
      • 8.7.12 nthArg
      • 8.7.13 over, overEvery and overSome
      • 8.7.14 toPath
      • 8.7.15 castArray
    • 8.8 Stub
    • 8.9 Default to
  • 9. Chaining
    • 9.1 Wrapper
    • 9.2 Explicit chaining
    • 9.3 tap
    • 9.4 thru
  • 10. String Templates
    • 10.1 interpolate
    • 10.2 escape
    • 10.3 evaluate
    • 10.4 imports
    • 10.5 Data object name
  • 11. Recipes
    • 11.1 Filter an object’s properties
      • 11.1.1 Scenario
      • 11.1.2 Solution
    • 11.2 Push an array of elements into an array
      • 11.2.1 Scenario
      • 11.2.2 Solution
    • 11.3 Process data for C3.js pie chart
      • 11.3.1 Scenario
      • 11.3.2 Solution
    • 11.4 Create a unique array of objects
      • 11.4.1 Scenario
      • 11.4.2 Solution
    • 11.5 Convert an array to an object
      • 11.5.1 Scenario
      • 11.5.2 Solution
  • Notes

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