(32)Everything Be True

Everything Be True
32-ой день программы "#100 Days Of Code"

Check if the predicate (second argument) is truthy on all elements of a collection (first argument).

Remember, you can access object properties through either dot notation or [] notation.

function truthCheck(collection, pre) {

  for(var i = 0; i < collection.length; i++){
    if(!collection[i][pre])
      return false;
  }
  return true;
}

truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex");

Ответы:

truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")
return true.

truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")
return false.

truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 0}, {"user": "Dipsy", "sex": "male", "age": 3}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age")
return false.

truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastFoward", "onBoat": null}], "onBoat")
return false

truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastFoward", "onBoat": true}], "onBoat")
return true

truthCheck([{"single": "yes"}], "single")
return true

truthCheck([{"single": ""}, {"single": "double"}], "single")
return false

truthCheck([{"single": "double"}, {"single": undefined}], "single")
return false

truthCheck([{"single": "double"}, {"single": NaN}], "single")
return false