[R] R as a programming language

[hadley wickham]

> My objection, at least, was that + should be *associative*.  I don't think
> anyone would expect a + b and b+a to be the same for strings, but I do
> think the fact that (a+b)+c and a+(b+c) would be different (if some of a,
> b,c were strings) has real potential for ugliness.

You're assuming an automatic cast from numbers into strings?  What if
a + "4" threw an error?

Hadley

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