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JavaScript Debugging

Debugging helps identify and fix errors in JavaScript code. Tools include browser developer consoles, breakpoints, console.log() statements, and debugging features in IDEs.

Key Topics

Using console.log()

console.log() prints messages to the console, helping you track variable values and flow.

Browser DevTools

Open the browser's developer tools to inspect elements, network requests, and debug JavaScript in real-time.

Setting Breakpoints

Set breakpoints in DevTools to pause code execution at a specific line and inspect variables at that moment.

Source Maps

Use source maps to debug minified or transpiled code as if it were original source code.

JavaScript Usage in DOM

Debugging helps ensure DOM manipulation code is correct. Inspect changes to elements, event handlers, and data updates to fix issues before deployment.

<script>
console.log("Debugging start...");
let x = 10;
console.log("x=", x);
// Use DevTools to set a breakpoint here and inspect the value
x = x * 2;
console.log("x after multiplication=", x);
</script>

Key Takeaways

  • Console Logging: Quickly inspect values.
  • DevTools: Powerful browser tools for stepping through code.
  • Breakpoints: Pause execution at exact points.
  • DOM Integration: Debug UI logic and ensure correct DOM updates.
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