Jquery vs document.querySelectorAll

Vanilla: The naturally-sweet JavaScript

Vanilla JavaScript comes into play when:

1. Latest standards are implemented commonly across modern browsers. No more #BrowserQuirks tweets!
2. Performance is key, avoid even the slightest overhead. Keep it light and fast!
3. Keeping it simple. You wouldn’t use a bulldozer to make a sandcastle, would you?
4. External libraries are a no-go due to size or security constraints.

Tip: Sizzle, jQuery's efficient selector engine, can be used separately.

jQuery: The fine wine of web development

Even in the evolving web development landscape, jQuery can be your elixir when:

1. Erratic browser behavior? jQuery #SupportsIE8 and takes care of browser-specific issues.
2. Addons galore! Plug into the vast jQuery plugin ecosystem.
3. Complex tasks like AJAX calls & animations get simplified. jQuery is your fairy godmother!
4. Is legacy code dictating terms or do you need advanced jQuery features? It's a viable choice.

Deep-dive comparison

Selections & Manipulations

Native JavaScript wins on speed and precision:

// Pssst! I heard document.querySelector is pursuing a speed-dating career. 😂
document.getElementById('id'); 
document.querySelector('.class');
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• These methods are well-optimized in modern JavaScript engines.
• Using jQuery can add the overhead of an additional library.

AJAX processing & Event handling

Native JavaScript is equipped for this:

// Fetch(), a web developer's good friend, reliable and efficient. Not a dog, though! 😅
fetch(url).then(response => response.json());
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• With the fetch API for AJAX and addEventListener for events, native code beats jQuery in performance.

Performance implications

• Need to smooth out browser inconsistencies? jQuery can help, but the cost in performance for modern browsers may not be warranted.
• Adopt native methods for speedier coding. There's an ongoing favorable shift towards standardization.

Case-by-case analysis

• Are jQuery's unique functionalities necessary? THE solution may rest in vanilla JavaScript.
• Your answers lie in the specific aims and scope of your project.

Deeper dive on important practices

Play wise with Native methods

• Use native code for performance-focused or browser-consistent applications. It's fast like a gazelle!
• Modern APIs such as Promise, Array, and String methods slice through many tasks once covered by jQuery, like a hot knife through butter.

Mellowing down on jQuery

• Regard youmightnotneedjquery.com as your genie to find substitutes in vanilla JavaScript.
• With native JavaScript development and standardization, the jQuery dependency is on a slow but sure decline.

Sizzle: Standalone savior

• Need for efficient querying? Hands tied by large library? Use Sizzle, jQuery's selector engine, as a solo performer. Less can be more!

Adjusting choices as per projects

• Is your project's success hinged on advanced jQuery functionalities? Fine-tune based on project requirements and analyze the need for each jQuery feature.