@trachea/lotide v1.0.0

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 @trachea/lotide

Require it:

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

Call it:

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

Documentation

The following functions are currently implemented:

• assertArraysEqual(arr1, arr2): Used for internal testing. Checks if arr1 and arr2 have the same elements
• assertEqual(a, b): Used for internal testing. Checks if a === b. Only works for primitive data types.
• assertObjectsEqual(obj1, obj2): Used for internal testing. Checks if the two objects: obj1 and obj2 have the same keys-value pairs.
• countLetters(string): Takes in a string and returns an object where the keys each unique letter in string and the values are the number of occurences in string.
• countOnly(arr, obj): Returns an objects where the keys are elements in arr such that the key exists in obj and it's value is true and the values are the number of occurences in arr.
• eqArrays(arr1, arr2): Returns true only if all the elements in arr1 exist in arr2 and the lenght of arr and arr2 are the same.
• eqObjects(obj1, obj2): Returns true only if both objects have the same number of key-value pairs and every key-value pair in obj1 exists in obj2.
• findKey(obj, function): Returns the first occurence of the key in obj that satisfies function. function must be a callback function that returns true only if a condition is met. If no key is found, returns undefined.
• findKeyByValue(obj, value): Returns the first occurence of the key in obj that has value value. If no key is found, returns undefined.
• flatten(arr): Returns a new array that is contains every element in arr flattened.
• head(arr): Returns the first element of arr.
• letterPositions(string): Returns an object that contains each unique letter in string where the value is an array where the element representing the index where the key appears in string.
• map(arr, function): Returns a new array that is the same length as arr and each element is the result of function(element).
• middle(arr): Returns an array that contains the middle value of arr. One value if length of arr is odd and two values if length of arr is even. If the length of arr is less or equal to two, then returns an empty array.
• tail(arr): Returns a new array which is arr without it's first element.
• takeUntil(arr, function): Returns an array that is all the elements in arr until an element satisifies function and function returns true;
• without(sources, values): Returns an array that is sources where all occurences of any element in values has been removed.