Comparing to null with double-equals

Compare a variable to null using two equal signs to check if it is null or undefined at the same time.

if (value === null || value === undefined) {
  // `value` is `null` or `undefined`
}

if (value == null) {
  // `value` is `null` or `undefined`
}

More fire tips

The ternary operator can be used at many levels. The further we move it into a statement, the more duplication it can save us.