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.
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/cmp
I 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
// filename: 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.
P.S. I was release 2.x version since new package cmp was included and now here is 2 packages:
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