diagonal-win.js

export class DiagonalWinInspector {
  constructor(columns) {
    this.column = columns;
  }
  //hi
  /*
        [*][*][*][*]
        [*][*][*][*]
        [*][*][*][*]
        [*][*][*][*]
        [*][*][*][*]
    */

  inspect() {
    for (let i = 5; i >= 3; i--) {
      if (this.column[0].getTokenAt(i) !== null) {
        if (
          this.column[0].getTokenAt(i) === this.column[1].getTokenAt(i - 1) &&
          this.column[0].getTokenAt(i) === this.column[2].getTokenAt(i - 2) &&
          this.column[0].getTokenAt(i) === this.column[3].getTokenAt(i - 3)
        ) {
          return this.column[0].getTokenAt(i);
        }
      }
    }

    for (let i = 2; i >= 0; i--) {
      if (this.column[0].getTokenAt(i) !== null) {
        if (
          this.column[0].getTokenAt(i) === this.column[1].getTokenAt(i + 1) &&
          this.column[0].getTokenAt(i) === this.column[2].getTokenAt(i + 2) &&
          this.column[0].getTokenAt(i) === this.column[3].getTokenAt(i + 3)
        ) {
          return this.column[0].getTokenAt(i);
        }
      }
    }
    return 0;
  }
}