@rosanna-z/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 @rosanna-z/lotide

Require it:

const _ = require('@rosanna-z/lotide');

Call it:

• head(1, 2, 3) // => 1
• tail(1, 2, 3) // => 2, 3
• middle(1, 2, 3) // => 2
• takeUntil(1, 2, 5, 7, 2, -1, 2, 4, 5, x => x < 0)) // => 1, 2, 5, 7, 2
• without(1, 2, 3, 1) // => 2, 3
• map("hi", "bye", word => word0) // => 'h', 'b'
• letterPositions('hello') // => { h: 0, e: 1, l: 2, 3, o: 4 }
• findKey({ "Blue Hill": { stars: 1 }, "Akaleri": { stars: 3 }, "noma": { stars: 2 }, "elBulli": { stars: 3 }, "Ora": { stars: 2 }, "Akelarre": { stars: 3 } }, x => x.stars === 2)); // => "noma"
• findKeyByValue({ sci_fi: "The Expanse", comedy: "Brooklyn Nine-Nine", drama: "The Wire" };, "The Wire") // => drama
• countOnly("Jason", "Salima", "Joe", { "Jason": true,}) // => {Jason: 1}
• countLetters("apple") // => // {a: 1, p: 2, l: 1, e:1}
• eqArrays(1, 2, 1, 2) // => true
• eqObects({1, 2}, {1, 2}) // => true
• assertEqual("5", "5") // => Assertion Passed
• assertArraysEqual(1, 2, 1, 2) // => Assertion Passed
• assertObjectsEqual({1, 2}, {1, 2}) // => Assertion Passed

Documentation

The following functions are currently implemented:

• head(array): returns the first element of an array
• tail(array): returns all the elements except for the head (first element) of an array
• middle(array): returns the middle-most element(s) of the array. If there are less than two elements, it returns an empty array. For arrays with odd number of elements, an array containing a single middle element will be returned. For arrays with an even number of elements, an array containing the two elements in the middle will be returned.
• takeUntil(array, function): returns an array when the callback provided returns a truthy value
• without(array, toRemoveFromArray): returns a subset of a given array, removing the unwanted elements
• map(array, function): returns a new array based on the results of the callback function
• letterPositions(string): returns an object where the keys are the letters, and the indexes are the values
• findKey(object, function): returns the first key when the callback returns a truthy value. If no key is found, then it will return undefined.
• findKeyByValue(object, string): returs the first key which contains the given value. If no key with that given value is found, then it will return undefined.
• countOnly(array, object): returns an object where the keys are the elements in the array that matched with a key in the object and each value is the number of times the key appeared in the array
• countLetters(string): returns an object that counts each letter in the string
• eqArrays(array, array): returns true or false, comparing two arrays based on a perfect match
• eqObjects(object, object): returns true or false if both objects have identical keys with identical values
• assertEqual(value, value): prints an assert message whether the two values are equal
• assertArraysEqual(array, array): prints an assert message whether the two arrays are equal
• assertObjectsEqual(object, object): prints an assert message whether the two objects are equal