I started some online course not long ago where after every section there is a little test. In the test there is a section where i can’t understand the answear no matter how hard i try please someone explain it to me how it get those answear.
The codes are: [2, 4, 7].filter(item=>item%2)
[0, true, ‘Boo’].filter( item =>item)
[1, 3, 6].filter(item=>item%2)
Thank you for help in advance.
const modArray = [2, 4, 7].filter(item=>item%2)
The above returned this array: 
callbackFn (which is (item=>item%2)
Function is a predicate, to test each element of the array. Return a value that coerces to
true to keep the element, or to
2%2 = 0 which is a falsy value; same for 4%2.
7%2 = 1 which a true value. So an array containing 7 was returned.
If I run this:
const modArray = [2, 4, 7].filter(item=>item%2 ===0)
I get [2,4]
Thank you very much now i understand it completly.