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kenton/gist:4039575

Created November 8, 2012 15:44
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gistfile1.txt
rp.total_discounts_amt = 0.0
rp.total_discounts_amt?
#=> false
so rp.total_discounts_amt? ? do_this_if_true : do_this_if_false
#=> always evaluates to do_this_if_false
but rp.total_discounts_amt.present? ? do_this_if_true : do_this_if_false
#=> will work as expected based on if value is present or nil
@jayhancock
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a || 1.0

@jayhancock
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a = 0.0
b = a || 1.0

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