JavaScript Code

JavaScript If with NOT Operator

If Statement with NOT

if (! condition) {
  //code
}
  • if is keyword
  • condition is a boolean expression
  • ! is JavaScript NOT operator

with the introduction of NOT operator, if condition is false, then if-block code is run

Examples

1. check if number in a is not negative

a = 42;

if (!(a < 0)) {
  console.log("a is not negative");
}

2. check if string in x is not empty

x = 'apple';

if (!(x.length == 0)) {
  console.log("string is not empty");
}

References