On: Do you really know JavaScript?

[trevorhartman]

Yes, but I don't know the answers to these questions because I know to avoid code like this.

[nfm → trevorhartman]

Sure, some of these examples are pretty academic (eg ` Array.isArray( Array.prototype )`). But can you truthfully say you never get bitten by basic JS arithmetic fails, given how many ways it's possible to accidentally coerce numbers to strings?

[trevorhartman → nfm]

Years ago, perhaps. Can't remember a specific instance.