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Update context.md (#1420)

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rthurgood
2018-11-21 18:09:17 +00:00
committed by Dan Abramov
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commit 13959877d3
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content/docs/context.md
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@@ -115,7 +115,7 @@ However, sometimes the same data needs to be accessible by many components in th
const MyContext = React.createContext(defaultValue);
```
Creates an Context object. When React renders a component that subscribes to this Context object it will read the current context value from the closest matching `Provider` above it in the tree.
Creates a Context object. When React renders a component that subscribes to this Context object it will read the current context value from the closest matching `Provider` above it in the tree.
The `defaultValue` argument is **only** used when a component does not have a matching Provider above it in the tree. This can be helpful for testing components in isolation without wrapping them. Note: passing `undefined` as a Provider value does not cause consuming components to use `defaultValue`.