Difference between revisions of "Solidity Terms"

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Latest revision as of 16:18, 21 March 2018

@@ Line 1: / Line 1: @@
-=Mappings=
+=[[Mappings]]=
-# One way hash function.
-# Cannot loop through a mapping
-# On Demand Data Structure
-# Hash key then get results
-# A hash function is any function that can me bused to map data of arbitrary size to data of fixed size
- contract MappingDemo {
- struct Person {
-  uint id;
-  bytes32 name;
-  bool isPerson;
- }
- mapping(address => Person) p;
- function getPerson(address _a) view public returns(uint, bytes32, bool)
- {
-  var person = p[_a];
-  // take the value of a and hash it using sha3(_a)
-  // once it hashes it, it will use that value, as the location of where in memory or value is.
-  // memory location 0x0a
-  return (person.id, person.name, person.isPerson);
- }
- function setPerson(address _a, uint _id, bytes32 _name) public{
-  var person = p(_a); // this will get the memory location
- }
- }