Haradkou SDET 
The Problem
At the previous article I was described my new package distributed via npm - @rslike/std - standard JS library which allows to remove undefined behavior in your code. But today, std is not a part of our story.
The Solution
Today, I’m gonna show you comparison package(@rslike/cmp). Using this package you can compare your classes and(or) objects like a pro.
How to install:
npm install @rslike/cmp
# or via yarn
yarn add @rslike/cmp
# or via pnpm
pnpm add @rslike/cmpI highly recommend to install @rslike/std package too, since if you would like to implement PartialEq - you need to use Option from @rslike/std package
Usage:
node.ts
import { type Ord, Ordering } from '@rslike/cmp'
import { None, Option, Some } from '@rslike/std'
class Node implements Ord {
left: Node | null
right: Node | null
constructor(readonly value: number) {
this.value = value
}
partialEquals(other: unknown): boolean {
return this.value == Number(other)
}
notEquals(other: unknown): boolean {
return !this.partialEquals(other)
}
partialCompare(other: unknown): Option<Ordering> {
const asNumber = Number(other)
if (this.value === asNumber) {
return Some(Ordering.Equal)
} else if (this.value > asNumber) {
return Some(Ordering.Greater)
} else if (this.value < asNumber) {
return Some(Ordering.Less)
}
return None()
}
lt(other: unknown): boolean {
return this.compare(other).isLt()
}
le(other: unknown): boolean {
return this.compare(other).isLe()
}
gt(other: unknown): boolean {
return this.compare(other).isGt()
}
ge(other: unknown): boolean {
return this.compare(other).isGe()
}
compare(other: unknown): Ordering {
return this.partialCompare(other).unwrap()
}
}Easy, isn’t it?
That’s because I use the same(mostly inspired) types(traits) from rustlang.
That’s it for today. Check it out std package.
UPD
P.S. I was release 2.x version since new package cmp was included and now here is 3 packages: