Access props inside quotes in React JSX

The "How-to" for Dynamic JSX Attributes

Considering JSX's lack of support for variable interpolation within an attribute value, curly braces prove their worth as a "skeleton key", opening doors to JS expressions such as props values and template literals.

{/* Img src: Easy peasy, lemon squeezy */} 
<img src={`images/${this.props.image}`} alt={this.props.altText} />
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Above, the image prop value seamlessly integrates into the src attribute. The leading "images/" remains untouched, making this a winning recipe for constructing attribute values dynamically.

Level-up Your Code with Getter Methods

You may think getter methods are overkill, but consider their ability to simplify complex logic and keep verbosity out of your JSX.

get imageUrl() {
  {/* Prepare for brevity... */}
  return `images/${this.props.highRes ? 'highres' : 'lowres'}/${this.props.image}`;
}

render() {
  return <img src={this.imageUrl} alt={this.props.altText} />;
  {/* Bam! An immaculate line of JSX */}
}
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The imageUrl getter method packages intricate logic into one crisp command, ensuring JSX stays neat.

Pitfalls, Traps, and Smart Choices

As you journey deeper into React's realm, you're bound to meet both temptations and threats. Here are a few tips to help you thrive.

Escaping from the Curly Brace Maze

If you ever need to use literal curly braces, remember, you have to "escape" them:

{/* Like a Houdini act */}
<div>{"{Say hello to curly braces}"}</div>
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Prop Up Your Attribute Values

When your JSX feature lengthy or complex prop accesses, consider it a sign of pending organization. Creating a separate utility function or custom hook might be the answer.

function useComputedClassName(base, condition) {
  return condition ? `${base}-${condition}` : base;
}

// Utilize the function inside a component
const className = useComputedClassName('button', props.isActive ? 'active' : null);
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The Unforgiving Abyss of Undefined Props

Never underestimate null checks if you don't want to face any nasty surprises midway:

<img src={props.image ? `images/${props.image}` : 'images/default.png'} />
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This handy line ensures a default path prevents any unscheduled halts if props.image is undefined.

Visualization

Imagine a chef (👨‍🍳) in the kitchen. Your props resemble ingredients and your recipe is the JSX component.

Recipe (JSX Component): "Add 2 spoons of *{sugar}* to the mix."
Sugar (Prop): sweetness = "2 spoons"

JSX uses props within the curly braces {} as a chef follows a recipe:

You write:    <div>Add {sweetness} of sugar to the mix.</div>
React serves: <div>Add 2 spoons of sugar to the mix.</div>
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And voila! The perfect dish, thanks to the quantity conveyed through {}:

| JSX Syntax       | Result           |
| ---------------- | ---------------- |
| `Add {sweetness}`| `Add 2 spoons`   |