If is necessary to wear a crash helmet when riding a motorbike.
You don't have to wear a crash helmet when riding a pushbike.

Both true statements; the presence of 'bike' in both does not make them contradictory.

Ditto: unless( cond ) { statement; } and statement unless cond;.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re^4: unless vs. bare block by BrowserUk
in thread unless vs. bare block by chayashida

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