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 @kenoreference/lotide

Require it:

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

Call it:

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

Documentation

The following functions are currently implemented:

• head(arr): takes in an array as input and returns the first element
• tail(arr): takes in an array as input and returns an array that contains all the elements except for the first.
• middle(arr): takes in an array as input and returns an array containing the middle element (or middle two if the length is even).
• assertEqual(expected, actual): takes in two primitive values as inputs and prints a message on the console indicating whether the values are equal or not.
• eqArrays(arr1, arr2): takes in two arrays as inputs and returns true if the arrays are equal (does not currently support arrays containing objects).
• assertArraysEqual(expected, actual): takes in two arrays as inputs and prints a message to the console indicating whether or not the arrays are equal (does not currently support arrays containing objects)
• flatten(arr): flattens an array with one level of nesting to an unnested array.
• without(source, itemsToRemove): takes in two arrays as inputs and returns the first array without any of the items in the second array
• countLetters(str): takes in a string as input and returns an object that records the count of each letter.
• letterPositions(str): takes in a string and returns an object of arrays containing the positions of each letter.
• countOnly(allItems, itemsToCount): takes in an array and an object of boolean values as inputs and returns the count of items in the array for which the callback function returns a truthy value.
• eqObjects(obj1, obj2): takes in two objects as inputs and returns true if both objects are equal.
• assertObjectsEqual(expected, actual): takes in two objects as inputs and prints a message to the console indicating whether the objects are equal.
• findKey(object, callback: takes in an object and a function as inputs and returns the key of the first value that returns a truthy value for the function.
• findKeyByValue(object, value): takes in an object and a string as inputs and returns the key of the first value that equals the string
• takeUntil(arr, callback): takes in an array and a callback function as inputs. Passes each array element into the callback function and returns an array that contains every element before the first element that returns a truthy value when passed into the callback function.
• map(arr, callback): takes in an array and a callback function and returns another array that contains the outputs when each element of the original array are passed into the callback function.