So there is no point to use the trick in this way if 0 is a valid amount as well.
Remember that on the left you put the condition, so you may write like the following:
𝐯𝐚𝐫 𝐜𝐨𝐢𝐧𝐬 = 𝟎; 𝐯𝐚𝐫 𝐨𝐛𝐣 = { 𝐧𝐚𝐦𝐞: "𝐉𝐨𝐡𝐧", ...𝐜𝐨𝐢𝐧𝐬>=0 && { 𝐜𝐨𝐢𝐧𝐬𝐀𝐦𝐨𝐮𝐧𝐭: 𝐜𝐨𝐢𝐧𝐬 } }
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So there is no point to use the trick in this way if 0 is a valid amount as well.
Remember that on the left you put the condition, so you may write like the following: