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The program needs to check if the second argument is a truthy element, and it must check this for each object in the first argument.

• JavaScript Truthy
• JavaScript Arguments

Remember to iterate through the first argument to check each object.

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Only if all of them are truth will we return true, so make sure all of them check.

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You could use loops or callbacks functions, there are multiple ways to solve this problem.

Solutions ahead!

Using for-in loop & hasOwnProperty

function truthCheck(collection, pre) {
  // Create a counter to check how many are true.
  var counter = 0;
  // Check for each object
  for (var c in collection) {
    // If it is has property and value is truthy
    if (collection[c].hasOwnProperty(pre) && Boolean(collection[c][pre])) {
      counter++;
    }
  }
  // Outside the loop, check to see if we got true for all of them and return true or false
  return counter == collection.length;
}

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

🚀 Run Code

• First I create a counter to check how many cases are actually true.
• Then check for each object if the value is truthy
• Outside the loop, I check to see if the counter variable has the same value as the length of collection, if true then return true, otherwise, return false

• JS Loops
• Object.prototype.hasOwnProperty()

Using Array.every()

function truthCheck(collection, pre) {
  return collection.every(function (element) {
    return element.hasOwnProperty(pre) && Boolean(element[pre]);
  });
}

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

🚀 Run Code

• Uses the native "every" method to test whether all elements in the array pass the test.
• This link will help Array.prototype.every()

• JS Array.prototype.every()
• MDN Array.prototype.every()

Using Array.reduce

function truthCheck(collection, pre) {
  return collection.reduce(function(acc, next) {
    if (next[pre]) {
      return acc;
    } 
    else {
      acc = false;
      return acc;
    }
  },true);
}

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

🚀 Run Code

• Set initial reduce value to true.
• Change it to false only when there is no key of a given name or it's falsy. Otherwise stick to the initial truthy value.

• JS Reduce Made Easy
• JS Array Reduce

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Thanks @Rafase282 @estevanmaito @HermanFassett for your help with Algorithm: Everything Be True

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