javascript - js native map

Question

var arr = [1,2,3,4,5,6];
var a = [];
a = arr.filter(function(i){ 
  if(i%2 == 0){
    return i
  }
})

What is the first sensory output?

How to make it output [2,4,6]

Answer 1

var arr = [1,2,3,4,5,6];
var a = [];
a = arr.filter(function(i){ 
  return i % 2 == 0
});
console.log(a);

Filter accepts true and false, but does not accept the original value of your array.

Answer 2

is the output....

a = [2,4,6]

Answer 3

Execute the specified function (callback) once for each element in the array, and create a new array. This array element is the original array element that returns true when all callback functions are executed.