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''runApp()'' function takes the given Widget and makes it the root of the widget tree. The following makes the Center widget the root. | ''runApp()'' function takes the given Widget and makes it the root of the widget tree. The following makes the Center widget the root. | ||
<source lang="dart"> | <source lang="dart" highlight="3"> | ||
void main() { | void main() { | ||
runApp( | runApp( | ||
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} | } | ||
</source> | </source> | ||
A widget's main job is to implement a '''build''' function, which describes the widget in terms of other, lower-level widgets. | |||