behavioral_iterator.js

const ITERATOR = {
  id: 'iterator',
  name: 'Iterator',
  type: 'behavioral',
  hint: 'Sequentially access the elements of a collection',
  definition: `Provide a way to access the elements of an aggregate object sequentially
    without exposing its underlying representation.`,
  when: "you want to access object's content without knowing how it is internally represented",
  codeES5: `function Pattern(el) {
  this.index = 0;
  this.elements = el;
}

Pattern.prototype = {
  next: function() {
    return this.elements[this.index++];
  },
  hasNext: function() {
    return this.index < this.elements.length;
  }
};

module.exports = Pattern;`,
  codeES6: `class Pattern {
  constructor(el) {
    this.index = 0;
    this.elements = el;
  }

  next() {
    return this.elements[this.index++];
  }

  hasNext() {
    return this.index < this.elements.length;
  }
}

export default Pattern;`
};

export default ITERATOR;