// Created by Muhammad Awwal Yusuf window.onload = () => { const company = { sales: [ { name: 'John', salary: 1000 }, { name: 'Alice', salary: 1600 } ], development: { sites: [ { name: 'Peter', salary: 2000 }, { name: 'Alex', salary: 1800 } ], internals: [ { name: 'Jack', salary: 1300 } ] } }; const sumSalary = ( o, prop, res ) => { if( !res ) res = { "Grand total" : 0, "Total employees" : 0, "Salary average" : 0, Divisions : new Set(), "Lowest rated employee" : null, "Highest rated employee" : null, }; const updateField = ( fieldID, divName, obj ) => { if( res[ fieldID ] ) { if( ( fieldID === "Lowest rated employee" ? res[ fieldID ].salary > obj.salary : res[ fieldID ].salary < obj.salary ) ) { res[ fieldID ] = { ...obj, division : divName }; } } else { res[ fieldID ] = { ...obj, division : divName }; } }; for( const field in o ) { if( Array.isArray( o[ field ] ) ) { const newKey = prop ? `${prop} >> ${field}` : field; const val = o[ field ] .reduce( ( total, emp ) => { total += emp.salary; res[ "Grand total" ] += emp.salary; res[ "Total employees" ]++; updateField( "Lowest rated employee", newKey, emp ); updateField( "Highest rated employee", newKey, emp ); return total; }, 0 ); res.Divisions.add( [ newKey, val ] ); } else { sumSalary( o[ field ], field, res ); } } res[ "Salary average" ] = res[ "Grand total" ] / res[ "Total employees" ]; return res; }; const pads = `${' '.repeat( 4 )}`; for( const [ key, value ] of Object.entries( sumSalary( company ) ) ) { switch( key ) { case "Divisions": pResult.innerHTML += `${key} (${value.size})
`; value.forEach( obj => pResult.innerHTML += `${pads}- ${obj[ 0 ]}
${pads.repeat( 2 )}Total salary: ${obj[ 1 ].toLocaleString()}
` ); break; case "Lowest rated employee": case "Highest rated employee": pResult.innerHTML += `${key}
`; for( const [ k, v ] of Object.entries( value ) ) { pResult.innerHTML += `${pads}- ${k} : ${k == 'salary' ? v.toLocaleString() : v}
`; } break; default: pResult.innerHTML += `${key} : ${value.toLocaleString()}
`; } } };

QA-3052362 - Sum employee salaries grouped by division