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 @bwong.yh/lotide

Require it:

const _ = require('@bwong.yh/lotide');

Call it:

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

Documentation

The following functions are currently implemented:

• assertEqual(arg1, arg2) {}: takes two primitive data arguments and does a strict comparsion between them, then logs the assertion result in the console.

• assertArraysEqual(arr1, arr2) {}: similar to assertEqual, except it takes two arrays, does a strict comparsion of elements in both arrays and logs assertion result in the console.

• assertObjectsEqual(obj1, obj2) {}: takes two objects and does a strict comparsion of the properties in both objects and logs the assertion result in the console.

• countLetters(str) {}: takes a string arguement and returns the counts of each letter in the string.

• countOnly([a, b, b], {a: true, b: false}) {}: takes an array as first arguement and an object as second argument. Then returns the counts for the element in the array that specified in the object.

• eqArrays(arr1, arr2) {}: takes two arrays and compares their elements. It returns true if the elements are the same, and false if different. This is used for arrays containing the SAME data type. It will NOT work with mixed data types arrays.

• eqObjects(obj1, obj2) {}: takes two objects and compares the properties in both objects. It returns true if properties are the same in both objects, and false if different. Please see eqArrays if property has an array as value.

• findKey(obj, callback) {}: takes an object and a callback function and returns the first key for the truthy value that the callback returned. Undefined is returned if no key is found.

• findKeyByValue(obj, arg) {}: takes in a value of an object and returns the first key that contains the value.

• flatten(nestedArr) {}: takes in an nested array and returns a "flattened" single-level array.

• head(arr) {}: takes an array and returns the first element of the array.

• letterPositions(str) {}: takes a string argument and returns the index position of each letter in the string.

• map(arr, callback): takes an array and callback function and returns a new array based on the the conditions specified in the callback.

• middle(arr) {}: takes an array and returns the middle element of the array. If the lenght of array is even, it returns the middle two elements of the array.

• tail(arr) {}: takes an array and returns a new array with elements start from the first position of the original array.

• tailUntil(arr, callback) {}: takes an array and a callback function and returns a new array with elements collected from the original array until callback returns truthy.

• without(arr1, arr2) {}: takes two arrays, source array and exclusion array (elements to be removed) respectively. A new array is returned with elements from the source array that are NOT in the exclusion array.