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 @defsax/lotide

Require it:

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

Call it:

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

Documentation

The following functions are currently implemented:

Array Fetching

• head(array): Returns the first element
• tail(array): Returns all elements except the first
• middle(array): Returns the middle element(odd) or elements(even)

Assertion Functions (DO NOT RETURN ANYTHING)

• assertObjectsEqual(obj1, obj2): Compares two objects and prints pass or fail
• assertArraysEqual(arr1, arr2): Compares two arrays and prints pass or fail
• assertEqual(x, y): Compares two primitives and prints pass or fail

Type Comparison

• eqObjects(obj1, obj2): Compares whether two objects are equivalent
• eqObjectsRecursive(obj1, obj2): Compares whether two objects are equivalent. uses recursion.
• eqArrays(arr1, arr2): Compares whether two arrays are equivalent. also checks array lengths, and if arrays are arrays

Useful Functions

• countLetters(str): Counts the letters in a sentence and returns an object containing the number of times each letter is used in the sentence. Returns in the format:

{
  a: 3, 
  b: 4, 
  etc...
}

• countOnly(allItems, itemsToCount): Takes a list of all items and a list of only the items that you want to count. Returns an object with the counted items and the number of times each one occurs. Returns in the format:

{
  countedItem1: numberOfOccurances,
  countedItem2: numberOfOccurances, 
  etc...
}

• findKey(obj, callback): Takes an object and a callback function and returns the key if that key's value matches callback callback's requirements.
• findKeyByValue(obj, val): Takes an object and a value and returns a key if that key's pair value matches the value passed in.
• flatten(arr): Takes a multi-layered array and returns a 1-dimensional array.
• letterPositions(str): Takes a phrase or sentence and returns an object that contains letters and their relative position in a zero based array.

{
  a: [0], 
  b: [1, 3, 5], 
  etc...
}

• map(arr, callback): Takes an array and a callback and returns a list of items that have been modified by the callback
• takeUntil(arr, callback): Takes an array and a callback and returns a list of items that exist in the array until the callback.
• without(arr, listToRemove): Takes an array and a list of items to remove. Returns an array with specified items removed.