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Nemil Dalal 2015-11-30 17:23:41 -05:00
parent add8f68f1a
commit 541c278de4
1 changed files with 13 additions and 7 deletions
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@ -30,10 +30,13 @@ contract AcmeBank {
// these are persistent throughout the life of the contract // these are persistent throughout the life of the contract
// a dictionary that maps addresses to balances // a dictionary that maps addresses to balances
mapping (address => uint) balances; // the private means that other contracts can't see balances
// but the data is still available to all other parties on the
// blockchain
mapping (address => uint) private balances;
// the 'public' makes 'owner' externally readable by users or contracts // the 'public' makes 'owner' externally readable by users or contracts
// (but not writeable) - // (but not writeable)
address public owner; address public owner;
// Constructor, can receive one or many variables here // Constructor, can receive one or many variables here
@ -125,9 +128,10 @@ var a = true;
// by default, all values are set to 0 on instantiation // by default, all values are set to 0 on instantiation
// Delete can be called on most types, and will set the values to 0 by assignment // Delete can be called on most types
// (it does NOT destroy the value, but rather sets the value to 0 by assignment)
uint x = 5; uint x = 5;
delete(x); // x is now 0 delete x; // x is now 0
// 2. DATA STRUCTURES // 2. DATA STRUCTURES
@ -151,8 +155,8 @@ function balances(address _account) returns (uint balance) {
} }
// To delete // To delete
delete(balances["John"]); delete balances["John"];
delete(balances); // deletes all elements delete balances; // deletes all elements
// Unlike languages like Javascript, you cannot iterate through all elements in // Unlike languages like Javascript, you cannot iterate through all elements in
// a map, without knowing the source keys // a map, without knowing the source keys
@ -166,7 +170,7 @@ Bank b = Bank({
owner: msg.sender, owner: msg.sender,
balance: 5 balance: 5
}); });
delete(b); // set all values to 0, except any mappings delete b; // set all variables in struct to 0, except any mappings
// Enums // Enums
enum State { Created, Locked, Inactive }; enum State { Created, Locked, Inactive };
@ -226,6 +230,7 @@ function increment(uint x, uint y) returns (uint x, uint y) {
uint (a,b) = increment(1,1); uint (a,b) = increment(1,1);
// The 'constant' indicates and ensures that a function does not/cannot change the persistent variables // The 'constant' indicates and ensures that a function does not/cannot change the persistent variables
// Constant function execute locally, not on the blockchain
uint y; uint y;
function increment(uint x) constant returns (uint x) { function increment(uint x) constant returns (uint x) {
@ -469,6 +474,7 @@ sha256("def");
## Sample contracts ## Sample contracts
- [Solidity Baby Step Contracts](https://github.com/fivedogit/solidity-baby-steps/tree/master/contracts) - [Solidity Baby Step Contracts](https://github.com/fivedogit/solidity-baby-steps/tree/master/contracts)
- [Consensys Contracts](https://github.com/ConsenSys/dapp-store-contracts) - [Consensys Contracts](https://github.com/ConsenSys/dapp-store-contracts)
- [State of Dapps](http://dapps.ethercasts.com/)
## Information purposefully excluded ## Information purposefully excluded
- Libraries - Libraries