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mention using several env vars for one setting in README

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Havoc Pennington 2011-11-28 01:37:29 -05:00
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README.md
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@ -208,8 +208,12 @@ vanishes if there's no value for `FORCED_BASEDIR`, but if you set
an environment variable `FORCED_BASEDIR` for example, it would be
used.
A natural extension of this idea is to support several different
environment variable names or system property names, if you aren't
sure which one will exist in the target environment.
Object fields and array elements with a `${?foo}` substitution
value just disappear if the substitution is not found.
value just disappear if the substitution is not found:
// this array could have one or two elements
path = [ "a", ${?OPTIONAL_A} ]