By calling one function after another, in sequence, you can have the program do different things in sequence.
doSomething();
doAnotherThing();
In JavaScript, the semicolon (;) is used to terminate (or end) a statement. However, in most cases, the semicolon is optional and can be omitted. So both code sequences below are legal:
doSomething()
doAnotherThing()
doSomething();
doAnotherThing();
In JavaScript, there is the concept of an empty statement, which is whitespace followed by
a semicolon in the context where a statement is expected.
So, the following code is an infinite loop
followed by a call to doSomething that will never execute:
while(true) ;
doSomething(); // THIS LINE WILL NEVER EXECUTE!
To avoid this problem, we don't allow a program to contain an empty statement, such as shown above. If you really want an empty statement, you need to use curly braces to delimit an empty statement block:
while(true) { }
doSomething(); // THIS LINE WILL NEVER EXECUTE!