Created
March 18, 2019 12:13
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| function double(x, opts) { | |
| if (!Number.isFinite(x)) { | |
| const error = `double(x): ${x} is not a number`; | |
| if (opts.onError) { | |
| return opts.onError(error) | |
| } | |
| return console.error(error) | |
| } | |
| return x * 2 | |
| } |
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