Java restricts the types of expressions that are allowed in so-called “expression statements”. Only meaningful expressions that have potential side effects are allowed. It disallows semantically meaningless statements like 0; or a + b;. They’re simply excluded from the language grammar. A function call like foo() can, and usually does, have side effects, so it is not a meaningless statement. … Read more
Are all statements also expressions? “Wherever JavaScript expects a statement, you can also write an expression. Such a statement is called an expression statement. The reverse does not hold: you cannot write a statement where JavaScript expects an expression. For example, an if statement cannot become the argument of a function.” This is comes from … Read more
Semantics is about meaning. It includes: the static semantics, which is the part that can be ascertained at compile time, including data typing, whether all variables are declared, which declaration applies to which variable in the case of scoping, what their type is, whether functions and methods are called with correct calling sequences, whether assignments … Read more
Incrementing / Decrementing Operators ++ increment operator — decrement operator These can go before or after the variable. If put before the variable, the increment/decrement operation is done to the variable first then the result is returned. If put after the variable, the variable is first returned, then the increment/decrement operation is done. For example: Live example In the case above ++$i is … Read more
Incrementing / Decrementing Operators ++ increment operator — decrement operator These can go before or after the variable. If put before the variable, the increment/decrement operation is done to the variable first then the result is returned. If put after the variable, the variable is first returned, then the increment/decrement operation is done. For example: Live example In the case above ++$i is … Read more
TL; DR In summary, syntax is the concept that concerns itself only whether or not the sentence is valid for the grammar of the language. Semantics is about whether or not the sentence has a valid meaning. Long answer: Syntax is about the structure or the grammar of the language. It answers the question: how do I … Read more
Ok for the recursive options when deleting files, but what is rimraf? Is it an acronym? Does it come from words combination? The word is fairly pleasant, I would like to know where does it come from.