array-methods-achieved-with-reduce

Repository with examples used in my Medium article How to use Reduce in Javascript

Installation

1. Clone this project.
2. Install all dependencies by opening this project in terminal and running

yarn

or

npm install

3. Launch already existing tests or write new/edit them according to your needs.

Tests

I'm using Jest as a testing framework. To launch tests, simply run

yarn test

or

npm run jest

Methods

Already in the repo

• filter
• flat
• Object.fromEntries
• map

Ones that should be doable quickly (easy and popular ones) and I might implement them soon

• every()
• some()
• find()
• findIndex()
• includes() - find with Boolean(result)
• lastIndexOf()
• indexOf()
• slice()

Focus on later (if ever)

• toString()
• push()
• join() - NodeLists though
• reduceRight() - reverse the input?
• reverse()
• splice()
• copyWithin()
• fill()
• flatMap()

Experimental

• at()

Problematic

• entries() - will have to create an iterator

• keys() - iterator

• values()

• Array.from() - sets

• pop() - two operations - might be a freebie but needs time to think

• shift() - as above

• unshift() - aa + a bit overkill to use reduce here

• sort()

• toLocaleString()

No point implementing

• toSource() - out of use
• forEach() - forEach is found in almost every language
• Array.isArray() - reduce is an Array.prototype method
• reduce() - :)
• concat()
• Array.of()