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Expressions in JavaScript

Explore how JavaScript expressions function within JSX to build dynamic React components. Understand valid expressions such as calculations, ternary operators, and array mapping. This lesson helps you grasp embedding code snippets that return values, crucial for enhancing React UI rendering.

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What is an expression in JavaScript?

What exactly does it mean for us to be able to use JavaScript expressions in JSX?

A JavaScript expression is not much more than a piece of code that will generate a value or return a result after its operation. Simply put, anything that you can write on the right side of a variable declaration ( after the = sign) is a JavaScript expression. Let’s look at some examples:

  1. Following one-liner is an expression whose value is 6:
1 + 5;
  1. This is another example of an expression that concatenates the two strings Hel and lo into a single value, Hello:
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