Multiple statements can be combined into a code block by using C-style syntax, beginning with { and ending with }:
if (test){
test = false;
console.log(test);
}
The best practice is to use code blocks with control statements, even if there's only one statement.
if (test)
alert(test); //valid, but error-prone and should be avoided
if (test){ //preferred
console.log(test);
}