30-seconds-of-code/snippets/Truth-check-objects.md

Truth-Check-Objects

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

• For every object in the collection array, check the truthiness of object’s property passed in pre parameter
• Array#every method internally checks if the value returned from the callback is truthy.
• Return true if it passes for every object. Otherwise, return false.
• Also if the object is empty then it will return false

truthCheck = (collection, pre) => (collection.every(obj => obj[pre]));

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