boolean of undefined code example

Example: string to boolean javascript

const stringBools = [
  'true',
  'false',
  'asdf'
];
const bools = [];

for (const i = 0; i < stringBools.length; i++) {
  const stringBool = stringBools[i];
  if (stringBool == true) {
    bools.push(true);
  } else if (stringBool == false) {
    bools.push(false);
  } else {
    bools.push(null /* Change if you like */);
  }
}