March 2019
Intermediate to advanced
636 pages
27h 50m
English
book
Blockchain Development with Hyperledger
by Salman A. Baset, Luc Desrosiers, Nitin Gaur, Petr Novotny
Content preview from Blockchain Development with Hyperledger
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Mapping
Mappings act as hash tables that consist of key types and corresponding value type pairs. Here is an example, as follows:
pragma solidity ^0.4.24;contract StudentScore { struct Student { uint score; string name; } mapping (address => Student) studtents; address[] public studentAccts; function setStudent(address _address, uint _score, string _name) public { Student storage studtent = studtents[_address]; studtent.score = _score; studtent.name = _name; studentAccts.push(_address) -1; } function getStudents() view public returns(address[]) { return studentAccts; } function getStudent(address _address) view public returns (uint, string) { return (studtents[_address].score, studtents[_address].name); } function countStudents() view public ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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