Required: Variable Found: Value

You switched the operands in your assign statement.

Switch this

Math.abs(a[i]-a[i-1]) = biggestGap;

to this

biggestGap = Math.abs(a[i]-a[i-1]);

Math.abs(a[i]-a[i-1]) returns just an int value (no variable reference or similar). So your trying to assign a new value to a value. Which is not possible. You can just assign a new value to a variable.

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