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 @nitram/lotide

Require it:

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

Call it:

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

Documentation

The following functions are currently implemented:

• head(arr): Takes arr, an array, and returns the first element in the array otherwise, undefined if array is empty.

• tail(arr): Takes arr, an array, and returns a new array object that contains all the elements in array but the first element. If array has only 0 or 1 element, an empty array is returned.

• middle(arr): Takes arr, an array, and returns a new array object containing the middle element of the array, if it has odd numbered elements. Otherwise, the middle two elements are returned in a new array object. An empty array is returned if the size of array is two or less.

• countLetters(myStr):Given a string, myStr, countLetters returns an object whose keys are the alphabet characters (upper and lower case characters are different) in myStr and it's value is count of that character in myStr.

• countOnly(allItems, itemsToCount)): Given an array, allItems, and a single level object, itemsToCount, countOnly returns an object containing counts of everything in allItems that itemsToCount listed; truthy values in itemsToCount will be counted.

• findKey(object1, callback)):Given an object, object1, and a callback function, return the first key such that the callback returns a truthy value. If no key is found, then it should return undefined.

• findKeyByValue(myObject, val): Given an object, myObject, find key will return the first key which has the value, val. Undefined is returned if no key is found.

• letterPositions(sentence): Returns an object whose keys are the alphabetical characters in the string, sentence and the values is an array of the positions of the characters.

• map(arr, callback): Takes in an array arr, and a callback function callback and returns a new array with the elements evaluated in the callback function

• takeUntil(array1, callback): Returns a 'slice' of the array array1, such that the slice ends upon the first truthy value is encountered when callback function is evaluated for that element.

• without(source, removeItems):Return a subset of a given array source, removing unwanted elements defined in the array removeItems.

• eqObjects(object1, object2): Returns true if and only if the inputs object1 and object2 are equal deeply, keys and values.

• eqArrays(arr1, arr2): Returns true if the two arrays arr1 and arr2 are equal.