If none of the if or else if conditions pass, then JavaScript moves forward and doesn’t run any of the conditional blocks of code. JavaScript skips any remaining conditionals after it runs the first one that passes.Īn else if statement doesn’t need a following else statement to work. You can use multiple if else conditionals, but note that only the first else if block runs. If the value on the left is false, it ignores the value on the right.īy now, you already learned about three ways to achieve conditional rendering in React: if/ else statements, the ternary operator and the & operator.You can also extend an if statement with an else if statement, which adds another conditional with its own block. This is called short-circuit-evaluation and it works like so: if the value on the left is true, it returns the value on the right. On line 14, we say, which means that the component will be rendered if what's before the & is true and it won't if what's before the & is false. To fix this, we could use the ternary operator and write something like:īut what if we want to skip the null rendering part all together? This is where & comes in handy. The operator can also be applied in different parts of the component. The problem with this is that we can't inline the condition in our JSX. Instead of using an if.else block, we can use the ternary conditional operator: condition expriftrue : expriffalse The operator is wrapped in curly braces, and the expressions can contain JSX, which you can wrap in parentheses to improve readability. We could of course do that using a simple if statement. Let's say we want to display a component or no component (null), based on a condition. We know it from Vanilla Javascript and it's called the and operator. If it looks familiar that's because it is. Today we talk about rendering using the & operator. As promised, I'm going to continue writing about conditional rendering in React and the most popular ways to achieve this behavior.
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