By default, the main axis is the vertical axis and cross axis is the horizontal axis in React native. Since justifyContent and alignItems property works based on the main axis and cross axis, so justifyContent will align flex items vertically and alignItems will layout flex item horizontally. This default value of the main axis and cross axis can be changed by changing flexDirection property. If we set flexDirection to row in the flex container then the main axis will become horizontal axis and cross axis will become vertical axis.
On changing default behaviour via flexDirection CSS property, the behaviour of alignItems and justifyContent will also get switched. The Concept of flexDirection is also present on the web. Flexbox is implemented as a single direction layout technique and this direction is managed by flexDirection CSS property. Apart from row and column, the flexDirection property has two more values: row-reverse and column-reverse. As the name suggests, the direction will remain horizontal and vertical but the direction will get changed.
Transitions are an important feature of mobile devices. So, this is one of the most frequently asked React Native interview questions and answers for senior developer in recent times.
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