https://github.com/himanshuteotia/typescript_with_nodejs

Typescript tutorial with simple projects like google map implementation and sorting algorithim
https://github.com/himanshuteotia/typescript_with_nodejs

Last synced: 4 months ago
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Typescript tutorial with simple projects like google map implementation and sorting algorithim

• Host: GitHub
• URL: https://github.com/himanshuteotia/typescript_with_nodejs
• Owner: himanshuteotia
• Created: 2020-04-10T05:45:48.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2020-06-27T09:38:44.000Z (almost 5 years ago)
• Last Synced: 2024-12-27T08:27:42.388Z (5 months ago)
• Language: TypeScript
• Homepage:
• Size: 2.16 MB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
Typescript

A junior to senior developer:

```you write interfaces & abstract classes I will write classes for them  ```

Abstract class :

1. We can not create objects directly

2. Only used as a parent class

3. An abstract class can have reference methods those we can define in child class

```

// here abstract class is saying provide me these three functions { compare, swap, length }

// I will do the sort for you

abstract class SortArray {

    abstract compare(leftIndex: number, rightIndex: number) : boolean;

    abstract swap(leftIndex: number, rightIndex: number) : void;

    abstract length:number;

      

    sort() : void {

        const { length } = this;

        for(let i =0; i < length; i++) {

            for( let j =0; j < length-1; j++ ) {

                if(this.compare(j, j+1)) {

                    this.swap(j,j+1)

                }

            }

        }

    }

}

  

class NumbersCollection extends SortArray {

    constructor(public data: number[]) {

        super()

    }

    get length():number{

        return this.data.length;

    }

    compare(leftIndex: number, rightIndex: number):boolean {

        return this.data[leftIndex] > this.data[rightIndex];

    }

    swap(leftIndex: number, rightIndex: number) {

        const leftHand = this.data[leftIndex];

        this.data[leftIndex] = this.data[rightIndex];

        this.data[rightIndex] = leftHand;

    }

}

const arr = new NumbersCollection([2,4,8,2,4,8,2,4,8])

arr.sort()

console.log(arr.data);

// [2, 2, 2, 4, 4, 4, 8, 8, 8]

```