Learn-JavaScript/10. String Manipulation.html at main · Sandeep6135/Learn-JavaScript · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>JS String Methods 101</title>
    <style>
        body {
            font-family: system-ui;
            max-width: 500px;
            margin: 2rem auto;
            line-height: 1.5;
        }

        .result-box {
            background: #f4f4f9;
            padding: 1rem;
            border-radius: 8px;
            margin-top: 1rem;
        }

        input {
            padding: 8px;
            width: 60%;
        }

        button {
            padding: 8px 16px;
            cursor: pointer;
        }

        b {
            color: #2c3e50;
        }
    </style>
</head>

<body>

    <h2>String Operations</h2>
    <input id="userInput" type="text" placeholder="Type something...">
    <button onclick="processString()">Run</button>

    <div id="display" class="result-box">
        Results will appear here...
    </div>

    <script>
        function processString() {
            const rawValue = document.getElementById("userInput").value;
            const str = rawValue.trim(); // Removes whitespace from both ends

            if (!str) {
                document.getElementById("display").innerHTML = "<em>Please enter some text.</em>";
                return;
            }

            // Using an array to build the output clearly
            const results = [
                `<b>Original (trimmed):</b> ${str}`,
                `<b>.length:</b> ${str.length} (Total characters)`,
                `<b>.toUpperCase():</b> ${str.toUpperCase()}`,
                `<b>.toLowerCase():</b> ${str.toLowerCase()}`,
                `<b>.charAt(0):</b> ${str.charAt(0)} (First letter)`,
                `<b>.slice(0, 3):</b> ${str.slice(0, 3)} (First three letters)`,
                `<b>Template Literal:</b> "Welcome, ${str}!"`
            ];

            document.getElementById("display").innerHTML = results.join("<br>");
        }
    </script>

</body>

</html>