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| _Expressions_ |
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| # Conditional Fields |
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| Field comprehensions can also be used to |
| add a single field conditionally. |
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| Converting the resulting configuration to JSON results in an error |
| as `justification` is required yet no concrete value is given. |
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| <!-- CUE editor --> |
| _conditional.cue:_ |
| ``` |
| price: number |
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| // Require a justification if price is too high |
| justification: string if price > 100 |
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| price: 200 |
| ``` |
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| <!-- result --> |
| `$ cue eval conditional.cue` |
| ``` |
| price: 200 |
| justification: string |
| ``` |
