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Update COERCION.md

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Evgeny Poberezkin 2016-01-17 17:30:52 +00:00
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COERCION.md
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@ -9,6 +9,15 @@ Type coercion only happens if there is `type` keyword and if without coercion th
If there are multiple types allowed in `type` keyword the coercion will only happen if none of the types match the data and some of the scalar types are present (coercion to/from `object`/`array` is not possible). In this case the validating function will try coercing the data to each type in order until some of them succeeds.
The table below summarises possible type coercions.
|from&nbsp;type&nbsp;&rarr;<br>to&nbsp;type&nbsp;&darr;|string|number|bolean|null|
|---|:-:|:-:|:-:|:-:|
|string |-|`x`&rarr;`""+x`|`false`&rarr;`"false"`<br>`true`&rarr;`"true"`|`null`&rarr;`""`|
|number /<br>integer|Valid number /<br>integer: `x`&rarr;`+x`<br>|-|`false`&rarr;`0`<br>`true`&rarr;`1`|`null`&rarr;`0`|
|boolean |`"false"`&rarr;`false`<br>`"true"`&rarr;`true`<br>`"abc"`&nrarr;<br>`""`&nrarr;|`0`&rarr;`false`<br>`1`&rarr;`true`<br>`x`&nrarr;|-|`null`&rarr;`false`|
|null |`""`&rarr;`null`<br>`"null"`&nrarr;<br>`"abc"`&nrarr;|`0`&rarr;`null`<br>`x`&nrarr;|`false`&rarr;`null`<br>`true`&nrarr;|-|
## Coersion from string values
@ -44,8 +53,8 @@ Always possible, `'' + data` is used
#### To boolean type
Unlike JavaScript, only these numbers can be coerced to `boolean`:
- 1 -> `true`
- 0 -> `false`
- `1` -> `true`
- `0` -> `false`
#### To null type
@ -63,8 +72,8 @@ Unlike JavaScript, only these numbers can be coerced to `boolean`:
#### To number/integer types
- `true` -> 1
- `false` -> 0
- `true` -> `1`
- `false` -> `0`
#### To null type