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toml: update readme with value_opt() usage (#14569)

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Larpon 2022-05-31 18:02:33 +02:00 committed by GitHub
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vlib/toml/README.md
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@ -79,6 +79,10 @@ To query for a value that might not be in the document you
can use the `.default_to(...)` function to provide a can use the `.default_to(...)` function to provide a
default value. default value.
For cases where a default value might not be appropiate or
to check if a value exists you can use `doc.value_opt('query')?`
instead.
```v ```v
import toml import toml
@ -100,8 +104,15 @@ assert doc.value('table.array[0].a').string() == 'A'
// Provides a default value // Provides a default value
assert doc.value('non.existing').default_to(false).bool() == false assert doc.value('non.existing').default_to(false).bool() == false
// Check if value exist
// doc.value_opt('should.exist') or { ... }
// or
if value := doc.value_opt('table.array[1].b') {
assert value.string() == 'B'
}
// You can pass parts of the TOML document around // You can pass parts of the TOML document around
// and still use .value() to get the values // and still use .value()/.value_opt() to get the values
arr := doc.value('table.array') arr := doc.value('table.array')
assert arr.value('[1].b').string() == 'B' assert arr.value('[1].b').string() == 'B'
``` ```