Can I simplify this conditional statement that uses the logical negation operator?

Question

Sorry if this is a question such as "Logical operators 101". I look at my screen for 15 minutes, trying to wrap my head around me, but I'm stuck.

Is there a more concise / elegant way to express the following (this is JavaScript syntax, but this is not a language dependent question):

if (!something && !something_else) {
  // do something
}

Based on some experiments, this does not look like the logical equivalent:

if (!(something && something_else) {
  // do something
}

Also, can anyone recommend an online resource for further exploring such issues? I assume that this type of thing is covered by an abstract level in computer science curricula, and this is a significant gap in my programming knowledge that I really would like to fill. Thank!

Answer 1

(Not A) And (Not B)

:

Not (A Or B)

Answer 2

:

if (!(something || something else)) {
  // do something
}

.

Answer 3

,

if (!(something || something_else)) {
  // do something
}

! something && &! something_else " -, -", " (-, -)"

Answer 4

, , , , .