On Fri, Sep 25, 2009 at 2:24 PM, Charles Jolley <[email protected]> wrote:
> PS. Is there an official way to detect that I am running code in ES5 strict
> mode? I can't find it in the spec.
To summarize:
A conventional pattern for testing "Am I in >= ES5 strict mode?" is
if (function(){return this;}()) {
// I am not in strict mode
} else {
// I am in strict mode, and therefore in >= ES5
}
A conventional pattern for testing "Am I in >= ES5?" is
if (function(){"use strict";return this;}()) {
// I am in < ES5
} else {
// I am in >= ES5
}
For these to work, it is important that browser makers rolling out ES5
features incrementally not cause the ES5-sides of these tests to
succeed until their ES5 system is complete. In other words, much as it
pains me to suggest this, please implement strict mode last.
--
Cheers,
--MarkM
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