diff --git a/tips/07-children-props-type.md b/tips/07-children-props-type.md index 675b2f74..8c4549ac 100644 --- a/tips/07-children-props-type.md +++ b/tips/07-children-props-type.md @@ -7,7 +7,7 @@ prev: style-props-value-px.html next: controlled-input-null-value.html --- -Usually, a component's `this.props.children` is an array of components: +Usually, a component's children (`this.props.children`) is an array of components: ```js /** @jsx React.DOM */ @@ -22,21 +22,23 @@ var GenericWrapper = React.createClass({ }); React.renderComponent( - , + , mountNode ); ``` -To save an extra array allocation, it returns the component itself _without the array wrapper_ when there's only one child. +However, when there is only a single child, `this.props.children` will be the single child component itself _without the array wrapper_. This saves an array allocation. ```js /** @jsx React.DOM */ var GenericWrapper = React.createClass({ componentDidMount: function() { - // **warning**: yields 5 for length of the string 'hello', not 1 for the + console.log(Array.isArray(this.props.children)); // => false + + // warning: yields 5 for length of the string 'hello', not 1 for the // length of the non-existant array wrapper! - console.log(this.props.children.length); + console.log(this.props.children.length); }, render: function() { return
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