dictionary

class Dictionary {
  constructor() {
    this.obj = {};
    this.dictionary = {
      A: 2,
      B: 2,
      C: 2,
      D: 3,
      E: 3,
      F: 3,
      G: 4,
      H: 4,
      I: 4,
      J: 5,
      K: 5,
      L: 5,
      M: 6,
      N: 6,
      O: 6,
      P: 7,
      Q: 7,
      R: 7,
      S: 7,
      T: 8,
      U: 8,
      V: 8,
      W: 9,
      X: 9,
      Y: 9,
      Z: 9
    };
  }

  getHashByName(key) {
    let hash = "";
    for (let i of key) {
      hash += this.dictionary[i.toUpperCase()];
    }

    return hash;
  }

  add({ name, phone }) {
    const hash = this.getHashByName(name);
    this.obj[hash] = this.obj[hash] || []
    this.obj[hash].push({ name, phone });
  }

  findAll(keyStart) {
    const resultArr = [];
    Object.keys(this.obj).forEach(key => {
      if (key.startsWith(keyStart)) {
        resultArr.push(...this.obj[key]);
      }
    });

    return resultArr;
  }
}