@dkisel/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 @dkisel/lotide

Require it:

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

Call it:

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

Documentation

The following functions are currently implemented:

• assertArraysEqual(actual, expected): Compares two 1-D arrays and prints a Pass or Fail message.
• assertEqual(actual, expected): Compares two primitive values and prints a Pass or Fail message.
• assertObjectsEqual(actual, expected): Compares two objects with properties that are primitives or arrays and prints a Pass or Fail message.
• countLetters(string): Returns an object where keys are all letters in the string and corresponding values are their frequency.
• countOnly(allItems, itemsToCount): Takes an array of strings to count, and an object with strings as keys and 'true' or 'false' to indicate whether a string should be counted. Returns an object with strings in the list which should be counted as keys and their frequency as values.
• eqArrays(array1, array2): Returns True if 1-D arrays are equal and False otherwise.
• eqObjects(object1, object2): Returns True if two objects with properties that are primitives or arrays are equal and False otherwise.
• findKey(obj, callback): Takes an object and a callback function that returns a boolean. Returns the first key for which the value satisfies the condition given by the callback function.
• findKeyByValue(obj, value): Takes an object and a primitive, returns the first key of the object whose value is equivalent to the primitive.
• flatten(inputArray): Takes an array with at most one layer of depth, returns a 1-D array.
• head(inputArray): Returns the first element of the array.
• letterPositions(string): Returns an object where keys are all letters in the string and corresponding values are arrays with a list of their positions in the input string.
• map(array, callback): Returns a new array of elements created by calling the input callback function on each element of the input array.
• middle(inputArray): Outputs an array of 0 to 2 elements: empty if the array's length is < 3, otherwise one middle element if the array's length is odd or both middle elements if the array's length is even.
• tail(inputArray): Returns everything but the first element of the array
• tail(array, callback): Returns an array of the elements of the input array up to the first element (exclusive) which evaluates to 'true' when passed to the callback function
• withoutwithout(source, itemsToRemove): Returns an array of elements present in the source array but absent in the items to remove array