everything-be-true.js

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

function truthCheck(collection, pre) {
  for (let i = 0; i < collection.length; i++) {
    if (!collection[i][pre]) return false;
  }

  return true;
}

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