Map and Filter in ES6

example.js

var numbers = [1, 2, 3, -1, -2, -3];

var newMapNumbers = numbers.map((number) => {
    if(number > 0){
      number = number * 10
    }
    return number
})

var newFilterNumbers = numbers.filter((number) => {
    if(number > 0){
      return number;
    }
})

console.log('Map values', newMapNumbers)
console.log('Filter values', newFilterNumbers)

Map-Filter.js

function map(objList){
  var newArr = [];
  objList.foreach(function(obj){
      if(obj.id == 1){
          obj.job = 'New job';
      }
      newArr.push(obj);
  })
  return newArr;
}

function filter(objList){
  var newArr = [];
  objList.foreach(function(obj){
      if(obj.id == 1){
          obj.job = 'New job';
          newArr.push(obj);
      }
  })
  return newArr;
}

var newValues = map(todos);

var todos = [
    {
        id: 1,
        job: 'Get up',
        completed: true
    },
    {
        id: 2,
        job: 'Go to work',
        completed: true
    },
    {
        id: 3,
        job: 'Have lunch',
        completed: false
    },
    {
        id: 4,
        job: 'Go back to home',
        completed: false
    }
];