boolean-expression – Page 3

Python `if x is not None` or `if not x is None`? [closed]

September 6, 2022 by Tarik

There’s no performance difference, as they compile to the same bytecode: >>> import dis >>> dis.dis(“not x is None”) 1 0 LOAD_NAME 0 (x) 2 LOAD_CONST 0 (None) 4 COMPARE_OP 9 (is not) 6 RETURN_VALUE >>> dis.dis(“x is not None”) 1 0 LOAD_NAME 0 (x) 2 LOAD_CONST 0 (None) 4 COMPARE_OP 9 (is not) 6 … Read more

How can I convert a string to boolean in JavaScript?

August 22, 2022 by Tarik

Do: var isTrueSet = (myValue === ‘true’); using the identity operator (===), which doesn’t make any implicit type conversions when the compared variables have different types. This will set isTrueSet to a boolean true if the string is “true” and boolean false if it is string “false” or not set at all. Don’t: You should … Read more