Lodash tutorial covers the Lodash JavaScript library. In this introductory Lodash tutorial, we cover Lodash functions in multiple examples.
Lodash
The lodash method `_.min` exported as a module. - 4.0.1 - a JavaScript package on npm. Homepage Repository NPM JavaScript Download. Keywords lodash-modularized.
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Lodash is a JavaScript library which provides utility functions for common programming tasks. It uses functional programming paradigm.Lodash was inspired by
Underscore.js
.Lodash helps programmers write more concise and easier to maintain JavaScript code. Lodash contains tools to simplify programming with strings, numbers, arrays, functions and objects.
By convention, Lodash module is mapped to the underscore character.
Lodash installation
First, we install the Lodash library.
The Lodash library is installed locally with
npm
.We use Lodash version 4.17.11.
Inside a browser, we include the library in a
<script>
tag.Lodash version
In the first example, we determine the version of the Lodash library.
version.js
The example prints the version of the Lodash library.
By convention, the Lodash library is mapped to the underscore character.
The version is stored in the
VERSION
variable.We use Lodash version 4.17.5.
Lodash first and last array elements
The
_.first()
/_.head()
functions return the first array element; the _.last()
function returns the last array element.The example outputs the first and last elements of an array of words.
This is the output.
Lodash chunking array
The
_.chunk()
function creates an array of elements split into groups the length of the specified size.chunking.js
The example chunks the
nums
array into an array of two and three element subarrays.This is the output.
Getting array slice
The
_.slice()
method gets a slice from an array. It takes two indexes: the starting and ending index, where the starting index is inclusiveand the ending is exclusive.Pelham 123 full movie free. This film's been imitated so often because its makers were really at the top of their game. Owen Roizman (THE FRENCH CONNECTION) handled the gritty location photography; scripter Peter Stone contributed terse, funny dialogue; scene-stealers like Martin Balsam, Jerry Stiller, Dick O'Neill and others made their roles indelible; and David Shire's percussive score set a standard for the genre. The ending is classic.
The example creates two slices from the
nums
array.This is the output.
Lodash random number
The
_.random()
function produces random values betweenthe inclusive lower and upper bounds.random_vals.js
The example prints two random values.
We produce a random value between 0 and 10.
Here we produce a random value between 5 and 10.
Lodash random array element
With the
_.sample()
function, we can pick a random element from an array.The example picks a random word from an array with
_.sample()
.This is a sample output.
Lodash shuffling array elements
The
_.shuffle()
function shuffles a collection.shuffle_fun.js
The example creates three new randomly reorganized arrays from an initial array of words.
This is the output. The original array is not modified; the
_.shuffle()
function creates a new array.Lodash _.times function
The
_.times()
executes the function n times. In the example, we execute the innter function four times. The functionprints a word to the console.
This is the output.
Lodash _.delay function
The
_.delay()
function delays the execution of a function for the specified amount of milliseconds.delay_fun.js
The example outputs two messages. The first one is delayed for 150ms.
This is the output.
Lodash determine data type
Lodash contains functions which determine the data type of a value.
In the example, we determine the data types of the elements of an array.
We have an array of values, including numbers, a string, an array, and an object.
The
_.isNumber()
function checks if a value is a number.The
_.isString()
function checks if a value is a string.The
_.isArray()
function checks if a value is an array.The
_.isObject()
function checks if a value is an object.This is the output of the program.
Lodash _.range function
The Lodash
_.range()
function creates an array of numbers. The function accepts the start
, end
, and step
parameters.range_fun.js
In the code example, we create three ranges of values.
This line creates an array of values 0.9. The
end
value ismandatory, the start
and step
are optional.The end
is non-inclusive; therefore, value 10 is not included.Here we specify
start
and step
parameters.We create an array of values 0.14.Finally, we provide all three parameters. An array of 0, 5, and 10 valuesis created.
This is the output.
Lodash maximum and minimum
Lodash Min Js
Lodash allows to compute the maximum and minimum values of an array.
The example computes the minimum and maximum values of an array.
The
_.min()
function returns the minimum of the array.The
._max()
function returns the maximum of the array.To compute the minimum and maximum of object properties, we use the
_.minBy()
and .maxBy()
functions.This is the output.
Lodash _.sum function
The
_.sum()
function calculates the sum of array values.sum_fun.js
In the code example, we compute and print the sum of array values.
This is the output.
Lodash collection filter
The
_.filter()
function returns an array of elements for which the predicate function returns true.In the code example, we filter out positive values of an array.
A predicate is a fuction that returns a boolean value. In our case we havean anonymous function that returns true for values greater than 0.
This is the output.
Lodash collection partition
The partition operation splits the original collection into a pair of arrays. The first array contains elements for which the specified predicate yields true, while the second list contains elements for which the predicate yields false.
col_partition.js
With the
_.partition()
function we split the array into two arrays;the first contains positive values, the second one negative valaues.The
_.partition()
function creates two arrays according to thepredicate function. With the array destructuring operation, we assign thecreated arrays to two variables: nums2
and nums3
.This is the output.
Lodash collection reduce
Reduction is a terminal operation that aggregates list values into a single value. The
_.reduce()
function applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value. In the example, we use the reduce operation on a list of integers and strings.
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We calculate the sum of values. The
total
is the accumulator, the next
is the next value in the list. The
_.reduceRight()
accumulates a value starting with last element and applying the operation from right to left to each element and the current accumulator value. This is the output.
Lodash string case
Locash library contains several functions that work with the case of words.
![Lodash node js Lodash node js](/uploads/1/2/5/3/125379910/633556267.png)
string_case.js
In the example, we modify the case of words with
_.camelCase()
, _.capitalize()
, ._kebabCase()
, _lowerCase()
,and _.upperCase()
.This is the output.
Lodash string _.startsWith and _.endsWith
The
_.startsWith()
function determines if the string starts withthe specified string. The _.endsWith()
function determines if the string ends with the specified string. In the example, we print the words that start with 't' and end with 'k'.
This is the output.
Lodash string padding
Strings can be padded with a character if they are shorter than a specifiednumber.
string_pad.js
The example pads numbers with a dot character using
_.padStart()
. This is the output.
Lodash object keys and values
The
_.keys()
function returns an array of the property names of the JavaScript object and the _.values()
function returns an array of their values.In the example, we print the keys and values of a person object.
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This is the output.
Lodash iterate object properties
The
_.forIn()
function can be used to iterate over object properties.iter_object_props.js
In the example, we iterate over properties of a person object using
_.forIn()
.Import Lodash
This is the output.
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In this tutorial, we have introduced the Lodash JavaScript library.
Lodash Find
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