medium-return-struct-public-func-4.js

medium-return-struct-public-func-4.js

const Project = artifacts.require('./Project.sol')
const project = await Project.deployed()

const people = await project.getPeople([ 2, 5 ], { from: accounts[0] })

console.log('people =', people)
// this will print something like:
// people = [ ['0xdeadbeef', '0xabcdeff'], [123, 789] ]
//
// as you can see, we get back an array.  each element of this array
// represents a field in the struct type.  because we've returned
// many structs, each field has many values.  let's reassemble these
// into a more familiar (and more usable) format.

// we can figure out how many structs were returned by checking the
// length of any of the arrays that were returned.  they should all
// have the exact same length.
const numPeople = people[0].length

// for clarity's sake, let's define some constants so that we can see
// which field array we're accessing:
const FIELD_ADDR  = 0
const FIELD_FUNDS = 1

let peopleStructs = []
for (let i = 0; i < numPeople; i++) {
    const person = {
        addr:  people[FIELD_ADDR][i],
        funds: people[FIELD_FUNDS][i],
    }
    peopleStructs.push(person)
}

console.log('peopleStructs =', peopleStructs)
// this will print something like:
// peopleStructs = [
//     { addr: '0xdeadbeef', funds: 123 },
//     { addr: '0xabcdeff', funds: 789 }
// ]