JavaScript 忍者代码示例

以下是一些体现"JavaScript 忍者"技巧的代码片段，这些代码展示了JavaScript的高级用法和巧妙技巧：

1. 立即调用的函数表达式(IIFE)

(function(ninja) {
    console.log(ninja + " is stealthy!");
})("JavaScript");
// 输出: JavaScript is stealthy!

2. 闭包和私有变量

function createNinja() {
    let stealth = 100;
    
    return {
        getStealth: () => stealth,
        train: () => { stealth += 10; },
        attack: () => { stealth -= 5; }
    };
}

const jsNinja = createNinja();
jsNinja.train();
console.log(jsNinja.getStealth()); // 110

3. 函数柯里化

const ninjaGreeting = (name) => (weapon) => 
    `${name} attacks with ${weapon}!`;

const naruto = ninjaGreeting("Naruto");
console.log(naruto("shuriken")); // "Naruto attacks with shuriken!"

4. 高阶函数

const withNinjaSkills = (fn) => (...args) => {
    console.log("Stealth mode activated...");
    const result = fn(...args);
    console.log("Disappearing in smoke...");
    return result;
};

const calculate = (a, b) => a + b;
const ninjaCalculate = withNinjaSkills(calculate);

console.log(ninjaCalculate(2, 3)); 
// Stealth mode activated...
// Disappearing in smoke...
// 5

5. 原型扩展（谨慎使用）

Array.prototype.shuriken = function() {
    return this.map(item => item + " hit!");
};

console.log([1, 2, 3].shuriken()); // ["1 hit!", "2 hit!", "3 hit!"]

6. 解构赋值技巧

const ninja = {
    name: "Hattori",
    clan: "Iga",
    weapons: ["katana", "shuriken", "smoke bomb"]
};

const { name: ninjaName, weapons: [primaryWeapon, ...otherWeapons] } = ninja;

console.log(`${ninjaName} prefers ${primaryWeapon}`); 
// Hattori prefers katana

7. 递归和尾调用优化

function ninjaCountdown(n) {
    return n > 0 ? (console.log(n + "..."), ninjaCountdown(n - 1)) 
                 : console.log("Attack!");
}

ninjaCountdown(3);
// 3...
// 2...
// 1...
// Attack!

8. 使用Proxy实现"隐身术"

const ninja = {
    name: "Hanzo",
    skills: ["stealth", "espionage"]
};

const invisibleNinja = new Proxy(ninja, {
    get(target, prop) {
        return prop in target ? target[prop] : "Nothing to see here...";
    }
});

console.log(invisibleNinja.name); // "Hanzo"
console.log(invisibleNinja.age);  // "Nothing to see here..."

注意：这些"忍者"技巧虽然有趣，但在生产代码中应谨慎使用，优先考虑代码的可读性和可维护性。真正的JavaScript忍者知道何时使用高级技巧，何时保持代码简单明了。