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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Go Interview Handbook — Saqib Razzaq</title>
<style>
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
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/* ── Layout ────────────────────────────────────────────────── */
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grid-template-columns: 200px 1fr;
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/* ── Package Nav (left) ────────────────────────────────────── */
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.card-grid { grid-template-columns: 1fr; }
}
</style>
</head>
<body>
<!-- ═══════════════════════════════════════════════════════════ HERO -->
<div class="hero">
<h1>Go <span>Ultimate</span> Handbook</h1>
<p>A practical reference for the Go programming language — built for interview prep and everyday use.</p>
<p style="font-size:.8rem;color:var(--muted);margin-top:-20px;margin-bottom:16px">— Saqib Razzaq</p>
<div class="hero-pills">
<span>10 language topics</span>
<span>11 packages</span>
<span>Open source</span>
</div>
</div>
<!-- ═══════════════════════════════════════════════════════════ LAYOUT -->
<div class="layout">
<!-- LEFT: Package Nav -->
<nav class="pkg-nav">
<a href="index.html" class="home-link active">Go Handbook</a>
<div class="nav-group">Language</div>
<ul class="pkg-list">
<li><a href="basics.html"><span class="pkg-icon">📖</span>Basics</a></li>
<li><a href="data-structures.html"><span class="pkg-icon">📦</span>Data Structures</a></li>
<li><a href="concurrency.html"><span class="pkg-icon">🔀</span>Concurrency</a></li>
<li><a href="testing.html"><span class="pkg-icon">🧪</span>Testing</a></li>
<li><a href="reflection.html"><span class="pkg-icon">🔬</span>Reflection</a></li>
<li><a href="file-data.html"><span class="pkg-icon">📁</span>File & Data</a></li>
<li><a href="web.html"><span class="pkg-icon">🌐</span>Web</a></li>
<li><a href="packages-modules.html"><span class="pkg-icon">🗃</span>Packages & Modules</a></li>
<li><a href="performance.html"><span class="pkg-icon">⚡</span>Performance</a></li>
<li><a href="gotchas.html"><span class="pkg-icon">⚠️</span>Gotchas</a></li>
</ul>
<div class="nav-group">Packages</div>
<ul class="pkg-list">
<li><a href="strings-package-guide.html"><span class="pkg-icon">🔤</span>strings</a></li>
<li><a href="fmt-package-guide.html"><span class="pkg-icon">🖨</span>fmt</a></li>
<li><a href="strconv-package-guide.html"><span class="pkg-icon">🔢</span>strconv</a></li>
<li><a href="sort-package-guide.html"><span class="pkg-icon">📊</span>sort</a></li>
<li><a href="slices-package-guide.html"><span class="pkg-icon">🗂</span>slices</a></li>
<li><a href="io-package-guide.html"><span class="pkg-icon">🔌</span>io</a></li>
<li><a href="os-package-guide.html"><span class="pkg-icon">💻</span>os</a></li>
<li><a href="errors-package-guide.html"><span class="pkg-icon">⚠️</span>errors</a></li>
<li><a href="context-package-guide.html"><span class="pkg-icon">🎯</span>context</a></li>
<li><a href="time-package-guide.html"><span class="pkg-icon">⏱</span>time</a></li>
<li><a href="math-package-guide.html"><span class="pkg-icon">🧮</span>math</a></li>
</ul>
</nav>
<!-- MAIN CONTENT -->
<main class="content">
<!-- Language -->
<div class="home-section">
<div class="home-section-header">
<h2>Language</h2>
<span>Core Go concepts and patterns</span>
</div>
<div class="card-grid">
<a href="basics.html" class="topic-card">
<div class="tc-icon">📖</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">Basics</span>
</div>
<p class="tc-desc">Variables, constants, pointers, loops, functions, closures, defer, and error handling.</p>
<div class="tc-tags">
<span>Variables</span><span>Pointers</span><span>Closures</span><span>Errors</span><span>Defer</span>
</div>
</div>
</a>
<a href="data-structures.html" class="topic-card">
<div class="tc-icon">📦</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">Data Structures</span>
</div>
<p class="tc-desc">Structs, embedding, slices, maps, interfaces, type assertions, and generics.</p>
<div class="tc-tags">
<span>Structs</span><span>Slices</span><span>Maps</span><span>Interfaces</span><span>Generics</span>
</div>
</div>
</a>
<a href="concurrency.html" class="topic-card">
<div class="tc-icon">🔀</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">Concurrency</span>
</div>
<p class="tc-desc">Goroutines, channels, select, WaitGroup, Mutex, sync.Once, atomic, and context.</p>
<div class="tc-tags">
<span>Goroutines</span><span>Channels</span><span>Select</span><span>Context</span>
</div>
</div>
</a>
<a href="testing.html" class="topic-card">
<div class="tc-icon">🧪</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">Testing</span>
</div>
<p class="tc-desc">Table-driven tests, benchmarks, test helpers, setup and teardown patterns.</p>
<div class="tc-tags">
<span>Table tests</span><span>Benchmarks</span><span>Helpers</span>
</div>
</div>
</a>
<a href="reflection.html" class="topic-card">
<div class="tc-icon">🔬</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">Reflection</span>
</div>
<p class="tc-desc">reflect.Type, reflect.Value, struct tags, and practical use cases for reflection.</p>
<div class="tc-tags">
<span>reflect.Type</span><span>reflect.Value</span><span>Struct tags</span>
</div>
</div>
</a>
<a href="file-data.html" class="topic-card">
<div class="tc-icon">📁</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">File & Data</span>
</div>
<p class="tc-desc">Reading and writing files, JSON encoding and decoding, buffers and streams.</p>
<div class="tc-tags">
<span>File I/O</span><span>JSON encode</span><span>JSON decode</span>
</div>
</div>
</a>
<a href="web.html" class="topic-card">
<div class="tc-icon">🌐</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">Web</span>
</div>
<p class="tc-desc">HTTP client and server, templates, middleware patterns, and database operations.</p>
<div class="tc-tags">
<span>HTTP</span><span>Templates</span><span>Middleware</span><span>Database</span>
</div>
</div>
</a>
<a href="packages-modules.html" class="topic-card">
<div class="tc-icon">🗃</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">Packages & Modules</span>
</div>
<p class="tc-desc">How Go modules work — go.mod, versioning, dependencies, workspaces, and private modules.</p>
<div class="tc-tags">
<span>go.mod</span><span>go get</span><span>Versioning</span><span>Workspaces</span>
</div>
</div>
</a>
<a href="performance.html" class="topic-card">
<div class="tc-icon">⚡</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">Performance</span>
</div>
<p class="tc-desc">Stack vs heap, escape analysis, pprof profiling, goroutine leaks, and writing efficient Go.</p>
<div class="tc-tags">
<span>pprof</span><span>Escape analysis</span><span>sync.Pool</span><span>Leaks</span>
</div>
</div>
</a>
<a href="gotchas.html" class="topic-card">
<div class="tc-icon">⚠️</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">Gotchas</span>
</div>
<p class="tc-desc">Tricky corners that trip up experienced developers — slices, nil interfaces, closures, channels, integers, defer, and more.</p>
<div class="tc-tags">
<span>Slices</span><span>nil</span><span>Closures</span><span>Channels</span><span>Defer</span>
</div>
</div>
</a>
</div>
</div>
<!-- Standard Library -->
<div class="home-section">
<div class="home-section-header">
<h2>Standard Library</h2>
<span>Package deep-dives with examples</span>
</div>
<div class="card-grid">
<a href="time-package-guide.html" class="topic-card">
<div class="tc-icon">⏱</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">time</span>
</div>
<p class="tc-desc">Dates, durations, formatting, parsing, timezones, timers and tickers.</p>
<div class="tc-tags">
<span>time.Time</span><span>Duration</span><span>Timezones</span><span>Timers</span>
</div>
</div>
</a>
<a href="strings-package-guide.html" class="topic-card">
<div class="tc-icon">🔤</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">strings</span>
</div>
<p class="tc-desc">Searching, splitting, replacing, trimming, building and comparing strings.</p>
<div class="tc-tags">
<span>Contains</span><span>Split</span><span>Replace</span><span>Trim</span>
</div>
</div>
</a>
<a href="fmt-package-guide.html" class="topic-card">
<div class="tc-icon">🖨</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">fmt</span>
</div>
<p class="tc-desc">Printf, Sprintf, Fprintf, format verbs, Stringer interface and Errorf.</p>
<div class="tc-tags">
<span>Printf</span><span>Sprintf</span><span>Stringer</span><span>Errorf</span>
</div>
</div>
</a>
<a href="errors-package-guide.html" class="topic-card">
<div class="tc-icon">⚠️</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">errors</span>
</div>
<p class="tc-desc">errors.New, error wrapping with %w, errors.Is, errors.As and custom error types.</p>
<div class="tc-tags">
<span>errors.Is</span><span>errors.As</span><span>Wrapping</span>
</div>
</div>
</a>
<a href="sort-package-guide.html" class="topic-card">
<div class="tc-icon">📊</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">sort</span>
</div>
<p class="tc-desc">Sorting slices, custom comparators, stable sort, and binary search.</p>
<div class="tc-tags">
<span>sort.Slice</span><span>sort.Search</span><span>Custom</span>
</div>
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<a href="math-package-guide.html" class="topic-card">
<div class="tc-icon">🧮</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">math</span>
</div>
<p class="tc-desc">Common math functions, constants, rounding, random numbers and math/rand.</p>
<div class="tc-tags">
<span>Abs</span><span>Round</span><span>Sqrt</span><span>rand</span>
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</div>
</a>
<a href="os-package-guide.html" class="topic-card">
<div class="tc-icon">💻</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">os</span>
</div>
<p class="tc-desc">Environment variables, file operations, process control, signals and exec.</p>
<div class="tc-tags">
<span>Getenv</span><span>ReadFile</span><span>Exit</span><span>Exec</span>
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<a href="strconv-package-guide.html" class="topic-card">
<div class="tc-icon">🔢</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">strconv</span>
</div>
<p class="tc-desc">Converting between strings and numeric types — Atoi, Itoa, ParseInt, ParseFloat and more.</p>
<div class="tc-tags">
<span>Atoi</span><span>Itoa</span><span>ParseInt</span><span>ParseFloat</span>
</div>
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</a>
<a href="context-package-guide.html" class="topic-card">
<div class="tc-icon">🎯</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">context</span>
</div>
<p class="tc-desc">Propagate deadlines, cancellation signals, and request-scoped values across API boundaries.</p>
<div class="tc-tags">
<span>WithCancel</span><span>WithTimeout</span><span>WithDeadline</span><span>WithValue</span>
</div>
</div>
</a>
<a href="io-package-guide.html" class="topic-card">
<div class="tc-icon">🔌</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">io</span>
</div>
<p class="tc-desc">Foundational Reader and Writer interfaces — the primitives everything else in Go I/O builds on.</p>
<div class="tc-tags">
<span>io.Reader</span><span>io.Writer</span><span>io.Copy</span><span>io.ReadAll</span>
</div>
</div>
</a>
<a href="slices-package-guide.html" class="topic-card">
<div class="tc-icon">🗂</div>
<div class="tc-body">
<div class="tc-header">
<span class="tc-title">slices</span>
</div>
<p class="tc-desc">Generic slice utilities added in Go 1.21 — sort, search, filter and transform slices cleanly.</p>
<div class="tc-tags">
<span>Contains</span><span>Sort</span><span>Reverse</span><span>Compact</span>
</div>
</div>
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