basant307/AI_Governance_Project

1/* global Set */2 3const undef = typeof undefined;4 5class ObjectSet {6  constructor( arrayOrObjectSet ){7    this._obj = Object.create(null);8    this.size = 0;9 10    if( arrayOrObjectSet != null ){11      let arr;12 13      if( arrayOrObjectSet.instanceString != null && arrayOrObjectSet.instanceString() === this.instanceString() ){14        arr = arrayOrObjectSet.toArray();15      } else {16        arr = arrayOrObjectSet;17      }18 19      for( let i = 0; i < arr.length; i++ ){20        this.add( arr[i] );21      }22    }23  }24 25  instanceString(){26    return 'set';27  }28 29  add( val ){30    let o = this._obj;31 32    if( o[ val ] !== 1 ){33      o[ val ] = 1;34      this.size++;35    }36  }37 38  delete( val ){39    let o = this._obj;40 41    if( o[ val ] === 1 ){42      o[ val ] = 0;43      this.size--;44    }45  }46 47  clear(){48    this._obj = Object.create(null);49  }50 51  has( val ){52    return this._obj[ val ] === 1;53  }54 55  toArray(){56    return Object.keys( this._obj ).filter( key => this.has(key) );57  }58 59  forEach( callback, thisArg ){60    return this.toArray().forEach( callback, thisArg );61  }62}63 64export default typeof Set !== undef ? Set : ObjectSet;65