how to say "and not" in javascript

How to say "and not" in JavaScript?

If you want to exclude something from a condition, you can use the "and not" operator. In JavaScript, the "and not" operator is represented by the exclamation mark followed by two equals signs (!==). This operator is used to test for values that are not equal to a specified value.

For example, let's say you want to test if a variable is not equal to the value "hello". You would write:

if (myVar !== "hello") {
  // Do something
}

This code will check if myVar is not equal to "hello", and execute the code inside the curly braces if it is true.

Another way to write the same code is by using the "not" operator (!) and the "equals" operator (==):

if (!(myVar == "hello")) {
  // Do something
}

The above code will also check if myVar is not equal to "hello", and execute the code inside the curly braces if it is true. However, this syntax can be a bit more confusing and harder to read, so it's recommended to use the first syntax.

It's important to note that the "and not" operator only checks if a value is not equal to a specified value. If you want to check if a value is not equal to any of several values, you can use the "or" operator (||) and multiple "not equals" conditions:

if (myVar !== "hello" || myVar !== "world") {
  // Do something
}

The above code will check if myVar is not equal to either "hello" or "world", and execute the code inside the curly braces if it is true.