OK. Thanks
On Wed, Oct 29, 2008 at 11:00 AM, Keryx Web <[EMAIL PROTECTED]> wrote:
> Brett Patterson skrev:
>
>> I like that explanation. I get it now. Thanks. One more quick question
>> though, what is a let-block, in general? Thanks. That really does make it a
>> lot easier to understand.
>>
>> Brett
>>
>
> Normally JavaScript does not have block scope.
>
> var foo = 1;
> {
> foo = 2;
> }
> alert(foo); // will give you 2
>
> Let-blocks will provide block-scope on an opt in basis:
>
> var foo = 1;
> {
> let foo = 2;
> alert(foo); // 2
> let bar = 3;
> }
> alert(foo); // 1
> alert(bar); // undefined
>
> Block scope is one feature that makes it easy to write interoperable code.
> My variables won't mess with your variables. Today we use function scope to
> accomplish the same thing:
>
> var foo = 1;
> (function() {
> var foo = 2;
> alert(foo); // 2
> })() // last parenthesis invokes anonymous function
> alert(foo); // 1
>
>
> Let blocks are really handy in for loops:
>
> var i = "Hi there";
> for ( let i = 0; i < 10; i++) {
> alert(i); // 0 - 9
> }
> alert(i); // "Hi there"
>
> Self executing functions have another kind of power through closures and
> possible return values, so the two do not completely overlap.
>
> More info on the "New in JavaScript 1.7" article on MDC.
>
>
> Lars Gunther
>
>
>
> *******************************************************************
> List Guidelines: http://webstandardsgroup.org/mail/guidelines.cfm
> Unsubscribe: http://webstandardsgroup.org/join/unsubscribe.cfm
> Help: [EMAIL PROTECTED]
> *******************************************************************
>
>
*******************************************************************
List Guidelines: http://webstandardsgroup.org/mail/guidelines.cfm
Unsubscribe: http://webstandardsgroup.org/join/unsubscribe.cfm
Help: [EMAIL PROTECTED]
*******************************************************************
