--- /dev/null
+# Delegates to `succ` on sucecss or to `fail` on error
+# ex: Thing.load 123, iferr cb, (thing) -> ...
+iferr = (fail, succ) -> (err, a...) ->
+ if err? then fail err
+ else succ? a...
+
+# Like iferr, but also catches errors thrown from `succ` and passes to `fail`
+tiferr = (fail, succ) -> iferr fail, (a...) ->
+ try succ a...
+ catch err then fail err
+
+# Delegate to the success function on success, or throw the error otherwise
+# ex: Thing.load 123, throwerr (thing) -> ...
+throwerr = iferr.bind null, (err) -> throw err
+
+# Prints errors when one is passed, or does nothing otherwise
+# ex: thing.save printerr
+printerr = iferr (err) -> console.error err.stack or err
+
+module.exports = exports = iferr
+exports.iferr = iferr
+exports.tiferr = tiferr
+exports.throwerr = throwerr
+exports.printerr = printerr