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function sum(a,b){  
     return a+b;  
}  
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var result = sum(1,2)  
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var result = sum(1);  
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sum(1,2,3,4,5)  
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function args(){return arguments;}  
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args(1,2,3,4,5,6);  
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function sum(){  
    var res= 0;  
    for(i=0;i<arguments.length;i++){  
        res+=arguments[i];  
    }  
    return res;  
}  
sum(1,2,3,4);  
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Functions are data
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function f(){return 1;}  
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var sum = function(a,b){return a+b;}  
var add = sum;  
sum=undefined;  
typeof sum;  
typeof add;  
add(1,2);  
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