@vkro/lotide v1.0.1

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 @vkro/lotide

Require it:

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

Call it:

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

Documentation

The following functions are currently implemented:

• head(arr): Returns the first item in an array
• tail(arr): Returns everything but the first item of an array
• middle(arr): Accepts an array and returns its middle-most element(s)
  • for arrays with 1 or 2 elements, return []
  • for arrays with odd number of elements, return array of a single middle element
  • for arrays with even number of elements, return array of two middle elements
• countLetters(str): Accepts a string; returns an object where each unique character in the string is a property of the object, with a corresponding value indicating the number of occurences for that character.
• countOnly(allItems, itemsToCount): Accepts an array strings to count, and an object specifying what to count. Returns an object containing counts of values in the string array that match keys in the object - but only those keys that have a truthy value.
• eqArrays(arr1, arr2): Accepts two arrays; returns true or false, based on a perfect match.
• eqObjects(obj1, obj2): Accepts two objects; returns true if both objects have identical keys with identical values. Otherwise returns false.
• findKey(object, callback): // Takes an object and callback function; returns first key for which callback returns truthy value. If no key is found, returns undefined.
• findKeyByValue(object, value): Receives an object and value; return first key in object that contains value. Otherwise, return undefined.
• flatten(arr): Accepts an array of arrays; returns a flattened version of the array.
• letterPosition(string): Accepts a string; return an object listing each unique character, with an array of all of its indices in the string, not counting spaces.
• map(arr, callback): Accepts an array to map, and a callback function. Returns new array based on results of callback.
• takeUntil(arr, callback): Accepts an array and a callback function; returns a slice of the array, with elements taken from the beginning, until the callback/predicate returns a truthy value. Callback is given only one value - the current item in array.
• without(source, itemsToRemove: Accepts two arrays; returns a new array with only the elements from source array that are not present in itemsToRemove array.
• assertEqual(actual, expected: Accepts two values; prints a message indicating if they match or not.
• assertArraysEqual(actual, expected): Accepts two arrays; logs a message in the console about whether they are equal or not.
• assertObjectsEqual(actual, expected): Accepts two objects; console.logs a message about whether they're equal or not.