https://github.com/cht8687/You-Dont-Need-Lodash-Underscore JavaScript
Lodash and Underscore are great modern JavaScript utility libraries, and they are widely used by Front-end developers. However, when you are targeting modern browsers, you may find out that there are many methods which are already supported natively thanks to ECMAScript5 [ES5] and ECMAScript2015 [ES6]. If you want your project to require fewer dependencies, and you know your target browser clearly, then you may not need Lodash/Underscore.
You are welcome to contribute with more items provided below.
**If you are targeting legacy JavaScript engine with those ES5 methods, you can use es5-shim
**Please note that, the examples used below are just showing you the native alternative of performing certain tasks. For some of the functions, Lodash provides you more options than native built-ins. This list is not a 1:1 comparison.
Make use of native JavaScript object and array utilities before going big.
—Cody Lindley, Author of jQuery Cookbook and JavaScript Enlightenment
You probably don't need Lodash. Nice List of JavaScript methods which you can use natively.
—Daniel Lamb, Computer Scientist, Technical Reviewer of Secrets of the JavaScript Ninja and Functional Programming in JavaScript
I guess not, but I want it.
—Tero Parviainen, Author of build-your-own-angular
I'll admit, I've been guilty of overusing #lodash. Excellent resource.
—@therebelrobot, Maker of web things, Facilitator for Node.js/io.js
Array
_.concat _.fill _.find _.findIndex _.indexOf _.join _.lastIndexOf _.reverse Collection*
❗ Important: Note that the native equivalents are array methods,
and will not work with objects. If this functionality is needed,
then Lodash/Underscore is the better option.
_.each _.every _.filter _.includes _.map _.reduce _.reduceRight _.size _.some Function
_.after Lang
_.isNaN Object
_.assign _.keys String
_.repeat _.toLower _.toUpper _.trim Creates a new array concatenating array with any additional arrays and/or values.
// Underscore/Lodash
var array = [1 ]
var other = _ .concat (array, 2 , [3 ], [[4 ]])
console .log (other)
// output: [1, 2, 3, [4]]
// Native
var array = [1 ]
var other = array .concat (2 , [3 ], [[4 ]])
console .log (other)
// output: [1, 2, 3, [4]] ⬆ back to top
Fills elements of array with value from start up to, but not including, end.
Note that fill is a mutable method in both native and Lodash/Underscore.
// Underscore/Lodash
var array = [1 , 2 , 3 ]
_ .fill (array, ' a' console .log (array)
// output: ['a', 'a', 'a']
_ .fill (Array (3 ), 2 )
// output: [2, 2, 2]
_ .fill ([4 , 6 , 8 , 10 ], ' *' 1 , 3 )
// output: [4, '*', '*', 10]
// Native
var array = [1 , 2 , 3 ]
array .fill (' a' console .log (array)
// output: ['a', 'a', 'a']
Array (3 ).fill (2 )
// output: [2, 2, 2]
[4 , 6 , 8 , 10 ].fill (' *' 1 , 3 )
// output: [4, '*', '*', 10] 45.0
31.0 ✔
Not supported
Not supported
7.1
⬆ back to top
Returns a value in the array, if an element in the array satisfies the provided testing function. Otherwise undefined is returned.
// Underscore/Lodash
var users = [
{ ' user' : ' barney' ' age' : 36 , ' active' : true },
{ ' user' : ' fred' ' age' : 40 , ' active' : false },
{ ' user' : ' pebbles' ' age' : 1 , ' active' : true }
]
_ .find (users, function (o ) { return o .age < 40 ; })
// output: object for 'barney'
// Native
var users = [
{ ' user' : ' barney' ' age' : 36 , ' active' : true },
{ ' user' : ' fred' ' age' : 40 , ' active' : false },
{ ' user' : ' pebbles' ' age' : 1 , ' active' : true }
]
users .find (function (o ) { return o .age < 40 ; })
// output: object for 'barney' 45.0
25.0 ✔
Not supported
Not supported
7.1
⬆ back to top
Returns an index in the array, if an element in the array satisfies the provided testing function. Otherwise -1 is returned.
// Underscore/Lodash
var users = [
{ ' user' : ' barney' ' age' : 36 , ' active' : true },
{ ' user' : ' fred' ' age' : 40 , ' active' : false },
{ ' user' : ' pebbles' ' age' : 1 , ' active' : true }
]
var index = _ .findIndex (users, function (o ) { return o .age >= 40 ; })
console .log (index)
// output: 1
// Native
var users = [
{ ' user' : ' barney' ' age' : 36 , ' active' : true },
{ ' user' : ' fred' ' age' : 40 , ' active' : false },
{ ' user' : ' pebbles' ' age' : 1 , ' active' : true }
]
var index = users .findIndex (function (o ) { return o .age >= 40 ; })
console .log (index)
// output: 1 45.0
25.0 ✔
Not supported
Not supported
7.1
⬆ back to top
Returns the first index at which a given element can be found in the array, or -1 if it is not present.
// Underscore/Lodash
var array = [2 , 9 , 9 ]
var result = _ .indexOf (array, 2 )
console .log (result)
// output: 0
// Native
var array = [2 , 9 , 9 ]
var result = array .indexOf (2 )
console .log (result)
// output: 0 ⬆ back to top
❗ Lodash only
Joins a list of elements in an array with a given separator.
// Lodash
var result = _ .join ([' one' ' two' ' three' ' --' console .log (result)
// output: 'one--two--three'
// Native
var result = [' one' ' two' ' three' join (' --' console .log (result)
// output: 'one--two--three' ⬆ back to top
Returns the index of the last occurrence of value in the array, or -1 if value is not present.
// Underscore/Lodash
var array = [2 , 9 , 9 , 4 , 3 , 6 ]
var result = _ .lastIndexOf (array, 9 )
console .log (result)
// output: 2
// Native
var array = [2 , 9 , 9 , 4 , 3 , 6 ]
var result = array .lastIndexOf (9 )
console .log (result)
// output: 2 ⬆ back to top
❗ Lodash only
Reverses array so that the first element becomes the last, the second element becomes the second to last, and so on.
// Lodash
var array = [1 , 2 , 3 ]
console .log (_ .reverse (array))
// output: [3, 2, 1]
// Native
var array = [1 , 2 , 3 ]
console .log (array .reverse ())
// output: [3, 2, 1] Voice from the Lodash author:
Lodash's _.reverse just calls Array#reverse and enables composition like _.map(arrays, _.reverse).
It's exposed on _ because previously, like Underscore, it was only exposed in the chaining syntax.
--- jdalton
⬆ back to top
❗ Important: Note that the native equivalents are array methods,
and will not work with objects. If this functionality is needed,
then Lodash/Underscore is the better option.
Iterates over a list of elements, yielding each in turn to an iteratee function.
// Underscore/Lodash
_ .each ([1 , 2 , 3 ], function (value , index ) {
console .log (value)
})
// output: 1 2 3
// Native
[1 , 2 , 3 ].forEach (function (value , index ) {
console .log (value)
})
// output: 1 2 3 ⬆ back to top
Tests whether all elements in the array pass the test implemented by the provided function.
// Underscore/Lodash
function isLargerThanTen (element , index , array ) {
return element >= 10
}
var array = [10 , 20 , 30 ]
var result = _ .every (array, isLargerThanTen)
console .log (result)
// output: true
// Native
function isLargerThanTen (element , index , array ) {
return element >= 10
}
var array = [10 , 20 , 30 ]
var result = array .every (isLargerThanTen)
console .log (result)
// output: true ⬆ back to top
Creates a new array with all elements that pass the test implemented by the provided function.
// Underscore/Lodash
function isBigEnough (value ) {
return value >= 10
}
var array = [12 , 5 , 8 , 130 , 44 ]
var filtered = _ .filter (array, isBigEnough)
console .log (filtered)
// output: [12, 130, 44]
// Native
function isBigEnough (value ) {
return value >= 10
}
var array = [12 , 5 , 8 , 130 , 44 ]
var filtered = array .filter (isBigEnough)
console .log (filtered)
// output: [12, 130, 44] ⬆ back to top
Checks if value is in collection.
var array = [1 , 2 , 3 ]
// Underscore/Lodash - also called with _.contains
_ .includes (array, 1 )
// → true
// Native
var array = [1 , 2 , 3 ]
array .includes (1 )
// → true 47✔
43 ✔
Not supported
34
9
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Translate all items in an array or object to new array of items.
// Underscore/Lodash
var array1 = [1 , 2 , 3 ]
var array2 = _ .map (array1, function (value , index ) {
return value * 2
})
console .log (array2)
// output: [2, 4, 6]
// Native
var array1 = [1 , 2 , 3 ]
var array2 = array1 .map (function (value , index ) {
return value * 2
})
console .log (array2)
// output: [2, 4, 6] ⬆ back to top
Applies a function against an accumulator and each value of the array (from left-to-right) to reduce it to a single value.
// Underscore/Lodash
var array = [0 , 1 , 2 , 3 , 4 ]
var result = _ .reduce (array, function (previousValue , currentValue , currentIndex , array ) {
return previousValue + currentValue
})
console .log (result)
// output: 10
// Native
var array = [0 , 1 , 2 , 3 , 4 ]
var result = array .reduce (function (previousValue , currentValue , currentIndex , array ) {
return previousValue + currentValue
})
console .log (result)
// output: 10 ⬆ back to top
This method is like _.reduce except that it iterates over elements of collection from right to left.
// Underscore/Lodash
var array = [0 , 1 , 2 , 3 , 4 ]
var result = _ .reduceRight (array, function (previousValue , currentValue , currentIndex , array ) {
return previousValue - currentValue
})
console .log (result)
// output: -2
// Native
var array = [0 , 1 , 2 , 3 , 4 ]
var result = array .reduceRight (function (previousValue , currentValue , currentIndex , array ) {
return previousValue - currentValue
})
console .log (result)
// output: -2 ⬆ back to top
Return the number of values in the collection.
// Underscore/Lodash
var result = _ .size ({one: 1 , two: 2 , three: 3 })
console .log (result)
// output: 3
// Native
var result2 = Object .keys ({one: 1 , two: 2 , three: 3 }).length
console .log (result2)
// output: 3 ⬆ back to top
Tests whether some element in the array passes the test implemented by the provided function.
// Underscore/Lodash
function isLargerThanTen (element , index , array ) {
return element >= 10
}
var array = [10 , 9 , 8 ]
var result = _ .some (array, isLargerThanTen)
console .log (result)
// output: true
// Native
function isLargerThanTen (element , index , array ) {
return element >= 10
}
var array = [10 , 9 , 8 ]
var result = array .some (isLargerThanTen)
console .log (result)
// output: true ⬆ back to top
❗ Note this is an alternative implementation
Creates a version of the function that will only be run after first being called count times. Useful for grouping asynchronous responses, where you want to be sure that all the async calls have finished, before proceeding.
var notes = [' profile' ' settings' // Underscore/Lodash
var renderNotes = _ .after (notes .length , render)
notes .forEach (function (note ) {
console .log (note)
renderNotes ()
})
// Native
notes .forEach (function (note , index ) {
console .log (note)
if (notes .length === (index + 1 )) {
render ()
}
}) ⬆ back to top
Checks if value is NaN.
// Underscore/Lodash
console .log (_ .isNaN (NaN ))
// output: true
// Native
console .log (isNaN (NaN ))
// output: true
// ES6
console .log (Number .isNaN (NaN ))
// output: true MDN:
In comparison to the global isNaN() function, Number.isNaN() doesn't suffer the problem of forcefully converting the parameter to a number. This means it is now safe to pass values that would normally convert to NaN, but aren't actually the same value as NaN. This also means that only values of the type number, that are also NaN, return true. Number.isNaN()
Voice from the Lodash author:
Lodash's _.isNaN is equiv to ES6 Number.isNaN which is different than the global isNaN.
--- jdalton
isNaNNumber.isNaN⬆ back to top
The method is used to copy the values of all enumerable own properties from one or more source objects to a target object.
// Underscore: _.extendOwn
// Lodash
function Foo () {
this .c = 3 ;
}
function Bar () {
this .e = 5 ;
}
Foo .prototype .d = 4 ;
Bar .prototype .f = 6 ;
var result = _ .assign (new Foo , new Bar );
console .log (result);
// output: { 'c': 3, 'e': 5 }
// Native
function Foo () {
this .c = 3 ;
}
function Bar () {
this .e = 5 ;
}
Foo .prototype .d = 4 ;
Bar .prototype .f = 6 ;
var result = Object .assign (new Foo , new Bar );
console .log (result);
// output: { 'c': 3, 'e': 5 } 45✔
34✔
No support
32✔
9✔
⬆ back to top
Retrieve all the names of the object's own enumerable properties.
// Underscore/Lodash
var result = _ .keys ({one: 1 , two: 2 , three: 3 })
console .log (result)
// output: ["one", "two", "three"]
// Native
var result2 = Object .keys ({one: 1 , two: 2 , three: 3 })
console .log (result2)
// output: ["one", "two", "three"] ⬆ back to top
❗ Lodash only
Repeats the given string n times.
// Lodash
var result = _ .repeat (' abc' 2 )
// output: 'abcabc'
// Native
var result = ' abc' repeat (2 )
console .log (result)
// output: 'abcabc' 41✔
24✔
Not supported
Not supported
9
⬆ back to top
❗ Lodash only
Lowercase a given string.
// Lodash
var result = _ .toLower (' FOOBAR' console .log (result)
// output: 'foobar'
// Native
var result = ' FOOBAR' toLowerCase ()
console .log (result)
// output: 'foobar' ⬆ back to top
❗ Lodash only
Uppercase a given string.
// Lodash
var result = _ .toUpper (' foobar' console .log (result)
// output: 'FOOBAR'
// Native
var result = ' foobar' toUpperCase ()
console .log (result)
// output: 'FOOBAR' ⬆ back to top
❗ Lodash only
Removes leading and trailing whitespace characters from string.
// Lodash
var result = _ .trim (' abc ' console .log (result)
// output: 'abc'
// Native
var result = ' abc ' trim ()
console .log (result)
// output: 'abc' 5.0✔
3.5✔
9.0✔
10.5✔
5.0✔
⬆ back to top
MIT
