What is the method of defining a variable within an if statement?

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In most programming languages, a variable can be defined within an if statement by using the let or var keyword followed by the variable name and assignment operator, like so:

if (condition) { let variableName = value; }

This creates a variable that is only accessible within the if block or scope of the condition. If the variable is needed outside of the if statement, it should be declared outside of the if statement.