Functions

What Are Functions?

Functions are reusable blocks of code that perform a specific task. They help you:

• Avoid repeating code
• Organize your code logically
• Make code easier to understand and maintain

Creating Functions

// Function declaration
function calculateMixDuration(trackCount, avgDuration) {
    return trackCount * avgDuration;
}

// Call the function
let totalDuration = calculateMixDuration(10, 240);
console.log(totalDuration); // 2400

// Arrow functions (modern syntax)
const detectBPM = (audioBuffer) => {
    // Analysis code here
    return 128;
};

// Functions with multiple parameters
function createTransition(track1, track2, duration) {
    return {
        from: track1,
        to: track2,
        duration: duration,
        type: "crossfade"
    };
}

Parameters and Return Values

// Parameters are inputs
function analyzeAudio(audioBuffer, sampleRate) {
    // Process audio
    const bpm = detectBPM(audioBuffer);
    const key = detectKey(audioBuffer);
    
    // Return is the output
    return {
        bpm: bpm,
        key: key,
        sampleRate: sampleRate
    };
}

// Using the function
const result = analyzeAudio(myAudio, 44100);
console.log(result.bpm); // 128

// Core analysis functions
async function analyzeTrack(file) {
    const buffer = await loadAudio(file);
    const bpm = detectBPM(buffer);
    const key = detectKey(buffer);
    const energy = calculateEnergy(buffer);
    
    return { file, buffer, bpm, key, energy };
}

// Transition planning
function planTransition(track1, track2) {
    const bpmDiff = Math.abs(track1.bpm - track2.bpm);
    const compatible = bpmDiff < 10;
    
    return {
        compatible,
        suggestedType: compatible ? "smooth" : "cut"
    };
}

// Export functions
function exportMix(tracks, format) {
    if (format === "mp3") {
        return encodeMP3(tracks);
    } else {
        return encodeWAV(tracks);
    }
}