for Angular

PostPositionPipe.ts

import { Pipe, PipeTransform } from "@angular/core";

@Pipe({name: "postPositionPipe"})
export class PostPositionPipe implements PipeTransform {
  private readonly CHAR_CODE_가 = 44032;
  private readonly CHAR_CODE_힣 = 55203;

  private isKoreanCharCode(charCode: number): boolean {
    return charCode >= this.CHAR_CODE_가 && charCode <= this.CHAR_CODE_힣;
  }

  transform(chracters: string, withFinalConsonant: string, withoutFinalConsonant: string): string {
    const lastCharCode = chracters.slice(-1).charCodeAt(0);
    if (!this.isKoreanCharCode(lastCharCode)) {
      return `${chracters}${withFinalConsonant}`;
    } else {
      return `${chracters}${(lastCharCode - this.CHAR_CODE_가) % 28 === 0 ? withoutFinalConsonant : withFinalConsonant}`;
    }
  }
}