JS面试题

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var x; // 声明 x
console.log(x);
console.log(typeof y);
console.log(z);

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var y = 1;
if (function f(){}) {
    y += typeof f;
}
console.log(y);

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console.log(mul(2)(3)(4)); // output : 24
console.log(mul(4)(3)(4)); // output : 48

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var output = (function(x){
    delete x;
    return x;
})(0);

console.log(output);

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var trees = ["xyz","xxxx","test","ryan","apple"];
delete trees[3];

console.log(trees.length);

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var bar = true;
console.log(bar + 0);   
console.log(bar + "xyz");  
console.log(bar + true);  
console.log(bar + false);

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var foo = function(){
    // Some code
};
function bar(){
    // Some code
};