contract SolidityMapping {
mapping(address => uint) public userBalances;

constructor() {}

function contribute() public payable {
userBalances[msg.sender] += msg.value;
// add user to separate arry
}

function findHighestBalance() public returns(address highest) {

}
}
1 function foo() {
2 console.log(b);
3 if (true) {
4 let b = 3;
5 }
6 console.log(b);
7 var a = 4;
8 }
9
10 var a = 1;
11 let b = 2;
12 console.log(a);
13 foo();
14 console.log(a);

##### h5

let numArms = data["arms"] || 2;

1. if (!data["arms"]) {
2 let numArms = 2;
3 }
4 else {
5 let numArms = data["arms"];
6 }

// What is the difference between x, y, and z?
// and what are the different types?
x = []
y = {}
z = ()

1 s = [0, 1, 2, 3, 4]
2 print(s[-1])