Preview:
let getA = a => a*a;
console.log(getA(2))
 
var b = 5 // outside the scope 
let square = () => {return b*b};
console.log(square())

// inside the scope
let square = (b) => {return b*b};
console.log(square(9))

let double = function(b){
    return b*b
};
console.log(double(10))
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