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 @ahsolo/lotide

Require it:

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

Call it:

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

Documentation

The following functions are currently implemented:

• head(arr): takes an array and returns the first element of the array.
• tail(arr): takes an array and returns a new array where the first element has been removed.
• middle(arr): takes an array and returns the middle element of the array. If the array has an even number of elements, the two middle-most elements are returned.
• eqArrays(arr1, arr2): takes two arrays and returns true if their length and contents are equal.
• eqObjects(obj1, obj2): takes two objects and returns true if their keys and values are equal.
• findKey(obj, callback): takes an object and a callback function. The callback function is called on each value of the object and the key associated with that particular value is returned.
• findKeyByValue(obj, value): takes an object and a primitive value. If such a value exists, the key associated with it will be returned.
• flatten: takes an array and flattens it by one level (if the array elements contain an array, the sub-array will be replaced by the contents of the sub-array, with the length of the original array increased accordingly).
• letterPositions: takes a sentence (string) and returns the positions of each of the letters within the sentence
• countLetters(str): takes an string and returns a count of each of the letters in the string.
• countOnly(arr, itemsToCount): takes an array of strings and an object specifying what to count, returns a count of the specified items.
• map(arr, callback): takes an array and a callback function and returns a transformed array created by applying the callback to each element of the original array.
• takeUntil(arr, callback): takes an array and a callback function and returns a slice of the array with elements taken from the beginning and until the element where the callback function evaluates to a truty value.
• without(arr, extractArr): takes an array and a second array of "extract" values and returns a new array with contents equal to the original array except with the extract values taken out.