Pure JavaScript Functions as a Replacement for Lodash

javascript_lodash.js

// 1. find
const users = [
  { 'user': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { 'user': 'chandler', 'age': 39 }
]

// Native
users.find(function (o) { return o.age < 40; })

//lodash
_.find(users, function (o) { return o.age < 40; })

// 2. filter
const numbers = [10, 40, 230, 15, 18, 51, 1221]       

_.filter(numbers, num => num % 3 === 0)
numbers.filter(num => num % 3 === 0)

// 3. first and rest
const names = ["first", "middle", "last", "suffix"]

const firstName = _.first(names) 
const otherNames = _.rest(names) 

const [firstName, ...otherNames] = names
console.log(firstName) // 'first'
console.log(otherNames) // [ 'middle', 'last', 'suffix' ]

// 4. each
_.each([1, 2, 3], (value, index) => {
  console.log(value)
})

[1, 2, 3].forEach((value, index) => {
  console.log(value)
})

_.forEach({ 'a': 1, 'b': 2 }, (value, key) => {
  console.log(key);
});

({ 'a': 1, 'b': 2 }).forEach((value, key) => { // !error
  console.log(key); 
});

// 5. every
const elements = ["cat", "dog", "bat"]

_.every(elements, el => el.length == 3)

elements.every(el => el.length == 3) //true

// 6. some
const elements = ["cat", "dog", "bat"]

_.some(elements, el => el.startsWith('c'))

elements.some(el => el.startsWith('c'))

// 7. includes
const primes = [2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,97]

_.includes(primes, 47)

primes.includes(79)

// 8. uniq
var elements = [1,2,3,1,2,4,2,3,5,3]

_.uniq(elements)

[...new Set(elements)]

// 9. compact
var array = [undefined, 'cat', false, 434, '', 32.0]
_.compact(array)
array.filter(Boolean)