Inside the function, you have:
for (i=1; i<6; i++) {
Which sets a new property, i, on the global/window object.
Using with, it would set the new property on the o object
as in:
with (o) {
eval ("i = 5"); /// <<< sets o.i = 5, not global.i = 5
}
> function(o) {
> o.writeln('<head>');
> o.write('<title>');
> o.write(obj.title);
> o.writeln('</title>');
> o.writeln('<body>');
> for (i=1; i<6; i++) { // <<<<<<<<<<<<<<<<<<<< sets a global property!
> o.write('<div>Line #');
> o.write(i);
> o.writeln('</div>');
> }
> o.writeln(</body>');
> o.writeln(</html>');
> }
Wrapping in a function like that is a way to avoid eval() altogether, perhaps.
On Jun 12, 2013, at 4:10 AM, Andreas Rossberg <[email protected]> wrote:
> On 11 June 2013 19:56, Michael Schwartz <[email protected]> wrote:
>> [...]
>>
>> Invocation might be something like:
>>
>> var o = {
>> out: '',
>> write: function(s) { o.out += s; },
>> writeln: function(s) { o.out += s + '\n'; }
>> obj: { title: 'whatever', otherMetaData: … }
>> };
>> with (o) {
>> eval(script);
>> }
>> ...
>> document.write(o.out);
>
> And what's wrong with replacing this by the following?
>
> {
> let out = ''
> function write(s) { o.out += s; },
> function writeln(s) { o.out += s + '\n'; }
> let obj = { title: 'whatever', otherMetaData: … }
> eval(script);
> }
>
> Moreover, if the script code is generated anyway, why not simply
> generate a function like:
>
> function(o) {
> o.writeln('<head>');
> o.write('<title>');
> o.write(obj.title);
> o.writeln('</title>');
> o.writeln('<body>');
> for (i=1; i<6; i++) {
> o.write('<div>Line #');
> o.write(i);
> o.writeln('</div>');
> }
> o.writeln(</body>');
> o.writeln(</html>');
> }
>
> Invoke as:
>
> eval(script)(o)
>
> So I don't see how your example is an argument for 'with'. Seems
> completely unnecessary.
>
> /Andreas
>
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