Björn Ruberg bjruberg

## lodash_size_by_function.csv

          
            Lodash Function
            Bytes minified and gzipped

            
              isNil.gz
              496

            
              isNull.gz
              496

            
              isObjectLike.gz
              499

            
              isUndefined.gz
              499

            
              defaultTo.gz
              501

            
              eq.gz
              502

            
              head.gz
              505

            
              isObject.gz
              509

            
              first.gz
              512

## lodash_shorthands.js
// native
array.map(item => item.field)
array.filter(item => item.value === 1)
array.sort(item => item.value)

// lodash's shorter variants
_.map(array, "field")
_.filter(array, { value: 1 })
_.sort(array, "value")

## lodash_type_safety.js
// native variant needs to protect against null values
const data = null
const result = Array.isArray(data) ? data.map(item => parseInt(item) : []

// not so with lodash
const result = _.map(null, item => parseInt(item))
// no exception, result is []


## lodash_implicit_conversion.js
// native variant
const objectValues = Object.values(dataObject)
const result = objectValues.map(item => parseInt(item))

// same as this lodash variant with implict conversion
const result = _.map(dataObject, item => parseInt(item))

## lodash_chain.js
import { chain, filter, map, sortBy, uniqBy, compact } from "lodash";

const messageList = [{ user: 1, messageId: 1, creationDate: new Date(), text: "Hello" }];

chain(messageList)
	.filter({ user: 1 })
	.sortBy("creationDate")
	.uniqBy("messageId")
	.map("text")
	.compact()

## lodash_uniqBy.js
import { uniqBy } from "lodash"
uniqBy(someCollection, "value")

## coded_uniqBy.js
const prepareArray = (arr, field) =>
  if Array.isArray(arr) {
    return arr.reduce((res, cur) => (res.length === 0 || cur[field] !== res[res.length - 1][field] ? [...res, cur] : res), [])
  }
  return []
}

prepareArray(someDataCollection, "value")
	Lodash Function	Bytes minified and gzipped
	isNil.gz	496
	isNull.gz	496
	isObjectLike.gz	499
	isUndefined.gz	499
	defaultTo.gz	501
	eq.gz	502
	head.gz	505
	isObject.gz	509
	first.gz	512
	// native
	array.map(item => item.field)
	array.filter(item => item.value === 1)
	array.sort(item => item.value)

	// lodash's shorter variants
	_.map(array, "field")
	_.filter(array, { value: 1 })
	_.sort(array, "value")
	// native variant needs to protect against null values
	const data = null
	const result = Array.isArray(data) ? data.map(item => parseInt(item) : []

	// not so with lodash
	const result = _.map(null, item => parseInt(item))
	// no exception, result is []
	// native variant
	const objectValues = Object.values(dataObject)
	const result = objectValues.map(item => parseInt(item))

	// same as this lodash variant with implict conversion
	const result = _.map(dataObject, item => parseInt(item))
	import { chain, filter, map, sortBy, uniqBy, compact } from "lodash";

	const messageList = [{ user: 1, messageId: 1, creationDate: new Date(), text: "Hello" }];

	chain(messageList)
	.filter({ user: 1 })
	.sortBy("creationDate")
	.uniqBy("messageId")
	.map("text")
	.compact()
	import { uniqBy } from "lodash"
	uniqBy(someCollection, "value")
	const prepareArray = (arr, field) =>
	if Array.isArray(arr) {
	return arr.reduce((res, cur) => (res.length === 0 \|\| cur[field] !== res[res.length - 1][field] ? [...res, cur] : res), [])
	}
	return []
	}

	prepareArray(someDataCollection, "value")