jscript, switch statement

David Fric
#1 / 4

switch statement

The documentation seeems to indicate that the label in a switch statement is
always an equality with the expression. IOW the label value must _equal_ the
expression.

Is this true or is it possible to use other comparison operators (e.g.,
greater than) inside the switch statement?

Thu, 30 Dec 2004 00:53:21 GMT

Lee
#2 / 4

switch statement

David said:

Quote:

>The documentation seeems to indicate that the label in a switch statement is
>always an equality with the expression. IOW the label value must _equal_ the
>expression.

>Is this true or is it possible to use other comparison operators (e.g.,
>greater than) inside the switch statement?

They must be equal. This is to allow the statement to be compiled
into something much more efficient than a series of if..else
statements.

Thu, 30 Dec 2004 02:15:45 GMT

Steve Fulto
#3 / 4

switch statement

Quote:

> The documentation seeems to indicate that the label in a switch statement
is
> always an equality with the expression. IOW the label value must _equal_
the
> expression.

> Is this true or is it possible to use other comparison operators (e.g.,
> greater than) inside the switch statement?

Shamelessly borrowed from Michael Harris's VBScript solution to the same
problem:

for (i=0; i<10; i++) {
x = Math.floor(Math.random()*150)+1;
switch (true) {
case (x<50): WScript.echo(x+" is less than 50."); break;
case (x<100): WScript.echo(x+" is between 50 and 100."); break;
default: WScript.echo(x+" is more than 100.");
}
}

Warning: Tested in JScript 5.6. This might not work in other versions of
J/Java/ECMAScript!

--
Be humble, if thou would'st attain to wisdom. Be humbler still, when wisdom
thou hast mastered. -Helena Petrovna Hahn Blavatsky

=-=-=
Steve
-=-=-

Thu, 30 Dec 2004 03:19:13 GMT

David Fric
#4 / 4

switch statement

Steve:

It works fine in IE6 but fails gracefully in NN4.77 (no error).

Pretty neat but who would have thunk it?

Dave

Quote:

> > The documentation seeems to indicate that the label in a switch
statement
> is
> > always an equality with the expression. IOW the label value must _equal_
> the
> > expression.

> > Is this true or is it possible to use other comparison operators (e.g.,
> > greater than) inside the switch statement?

> Shamelessly borrowed from Michael Harris's VBScript solution to the same
> problem:

> for (i=0; i<10; i++) {
> x = Math.floor(Math.random()*150)+1;
> switch (true) {
> case (x<50): WScript.echo(x+" is less than 50."); break;
> case (x<100): WScript.echo(x+" is between 50 and 100."); break;
> default: WScript.echo(x+" is more than 100.");
> }
> }

> Warning: Tested in JScript 5.6. This might not work in other versions of
> J/Java/ECMAScript!

> --
> Be humble, if thou would'st attain to wisdom. Be humbler still, when
wisdom
> thou hast mastered. -Helena Petrovna Hahn Blavatsky

> =-=-=
> Steve
> -=-=-

Thu, 30 Dec 2004 06:03:13 GMT