Mappings - Revision history

Bacchas at 18:13, 21 March 2018

2018-03-21T18:13:11Z

← Older revision		Revision as of 18:13, 21 March 2018
Line 24:		Line 24:
	}		}
	function setPerson(address _a, uint _id, bytes32 _name) public{		function setPerson(address _a, uint _id, bytes32 _name) public{
	var person = p(_a); // this will get the memory location		var person = p[_a]; // this will get the memory location
			person.id = _id;
			person.name = _name;
			person.isPerson = true;

	}		}

Bacchas at 16:19, 21 March 2018

2018-03-21T16:19:26Z

← Older revision		Revision as of 16:19, 21 March 2018
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			==Mappings==

	# One way hash function.		# One way hash function.
	# Cannot loop through a mapping		# Cannot loop through a mapping
Line 25:		Line 27:

	}		}


	}		}


	==[[#top\|Back To Top]]-[[Main_Page\| Home]] - [[Solidity_ethereum_Language\|Category]]==		==[[#top\|Back To Top]]-[[Main_Page\| Home]] - [[Solidity_ethereum_Language\|Category]]==

Bacchas: Created page with "# 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 dat..."

2018-03-21T16:18:58Z

Created page with "# 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 dat..."

New page

# 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

}

}

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