Lotide

A mini clone of the Lodash library.

Purpose

BEWARE: This library was published for learning purposes. It is not intended for use in production-grade software.

This project was created and published by me as part of my learnings at Lighthouse Labs.

Usage

Install it:

npm install @maggieholbling/lotide

Require it:

const _ = require('@maggieholbling/lotide');

Call it:

const results = _.tail([1, 2, 3]) // => [2, 3]

Documentation

The following functions are currently implemented:

• head(array): crops the array to only its [0] element and returns it

• tail(array): removes the [0] element of the array and returns it

• middle(array): returns the middle element of an array, if the array's length is even, it returns the two middle elements

• assertArraysEqual(expectedArray, actualArray): compares the expectedArray to the actualArray and prints out a message stating if they match or not

• assertEqual(expected, actual): compares the expected value to the actual value and prints out a message stating if they match or not

• assertObjectsEqual(expectedObject, actualObject): compares the expectedObject to the actualObject and prints out a message stating if they match or not

• countLetters(string): returns an object with keys representing each letter in the string and the value being the number of times the letter appears in the string

• countOnly(allItems, itemsToCount): returns an object, where the keys represent each element equaling to true in itemsToCount and the values are the number of times the element appears in allItems

  allItems: an array of strings that we need to look through

  itemsToCount: an object specifying what to count

• eqArrays(array1, array2): compares array1 to array2 and returns true if they match, false if they don't

• eqObjects(object1, object2): compares object1 to object2 and returns true if they match, false if they don't

• findKey(object, callback): scans the object and returns the first key for which the callback returns a truthy value

  If no key is found, then it returns undefined

• findKeyByValue(object, value): scans the object and returns the first key which contains the given value

  If no key with that given value is found, then it should return undefined

• flatten(arrayOfArrays): returns a "flattened" version of the arrayOfArrays

• letterPositions(string): returns an object, where the keys represent the string's characters and the values are the number of times the character appears in the string

• map(arrayToMap, callback): returns a new array based on the results of the callback function on arrayToMap's elements

• takeUntil(array, callback): returns a slice of the array, collecting elements from the array until the callback returns a truthy value

• without(array, unwantedArray): returns a subset of the array, removing unwantedArray's elements