What is short circuiting?

• Occurs when checking predicate logic.
• E.g: AND operator && -> If the left side of an operator fails, the rest of the predicate will not be checked. No way for the expression to be true.

if emailIsNotEmpty && passwordIsNotEmpty {
  ...
}

• Also used with an if let statement.
• If short circuiting did not kick in, the app could crash depending on the latter checks.

if let value = array.first, value != 100 {
  ...
}

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