Kopieren von zweidimensionalen Arrays

Question

Was soll ich mit einem zweidimensionalen Array tun, wenn ich jede Zeile davon kopieren und daraus ein neues zweidimensionales Array machen möchte?

Hier ist das Format dieser zweidimensionalen Matrix:

{ 
    "localTrain": "T7", 
    "TC": "2", 
    "TimeSheet": [ 
    ["01", "London", "BXP", "T7", "1632", "1640"], 
    ["02", "Shanghai", "QWE", "T7", "1200", "1240"], 
    ["03", "LosAngeles", "DFG", "T7", "1300", "1340"], 
    ["04", "NewDelhi", "VGH", "T7", "1400", "1440"], 
    ["05", "Sydney", "SAW", "T7", "1500", "1540"], 
    ["06", "Tokyo", "SAT", "T7", "1600", "1640"], 
    ["07", "Seoul", "BBT", "T7", "1700", "1740"], 
    ["08", "CapeTown", "OOP", "T7", "1800", "1840"], 
    ] 
} 

Und es sollte wie folgt aussehen:

{ 
    "localTrain": "T7", 
    "TC": "2", 
    "TimeSheet": [ 
    ["01", "London", "BXP", "T7", "1632", "1640"], 
    ["01", "London", "BXP", "T7", "1632", "1640"], 
    ["02", "Shanghai", "QWE", "T7", "1200", "1240"], 
    ["02", "Shanghai", "QWE", "T7", "1200", "1240"], 
    ["03", "LosAngeles", "DFG", "T7", "1300", "1340"], 
    ["03", "LosAngeles", "DFG", "T7", "1300", "1340"], 
    ["04", "NewDelhi", "VGH", "T7", "1400", "1440"], 
    ["04", "NewDelhi", "VGH", "T7", "1400", "1440"], 
    ["05", "Sydney", "SAW", "T7", "1500", "1540"], 
    ["04", "NewDelhi", "VGH", "T7", "1400", "1440"], 
    ["06", "Tokyo", "SAT", "T7", "1600", "1640"], 
    ["06", "Tokyo", "SAT", "T7", "1600", "1640"], 
    ["07", "Seoul", "BBT", "T7", "1700", "1740"], 
    ["07", "Seoul", "BBT", "T7", "1700", "1740"], 
    ["08", "CapeTown", "OOP", "T7", "1800", "1840"], 
    ["08", "CapeTown", "OOP", "T7", "1800", "1840"], 
    ] 
} 

Answer 1

einfach ein neues Objekt erstellen, das auf das alte Objekt ähnlich ist, mit Ausnahme Schleife durch jede TimeSheet Array-Element und schieben Sie es auf das neue Objekt TimeSheet Array nicht einmal, aber zweimal.

const oldObj = { 
 
    "localTrain": "T7", 
 
    "TC": "2", 
 
    "TimeSheet": [ 
 
    ["01", "London", "BXP", "T7", "1632", "1640"], 
 
    ["02", "Shanghai", "QWE", "T7", "1200", "1240"], 
 
    ["03", "LosAngeles", "DFG", "T7", "1300", "1340"], 
 
    ["04", "NewDelhi", "VGH", "T7", "1400", "1440"], 
 
    ["05", "Sydney", "SAW", "T7", "1500", "1540"], 
 
    ["06", "Tokyo", "SAT", "T7", "1600", "1640"], 
 
    ["07", "Seoul", "BBT", "T7", "1700", "1740"], 
 
    ["08", "CapeTown", "OOP", "T7", "1800", "1840"], 
 
    ] 
 
}; 
 

 
let newTimeSheet = []; 
 
oldObj.TimeSheet.forEach(arrForOneCity => { 
 
    newTimeSheet.push(arrForOneCity); 
 
    newTimeSheet.push(arrForOneCity); 
 
}); 
 

 
let newObj = { 
 
    localTrain: oldObj.localTrain, 
 
    TC: oldObj.TC, 
 
    TimeSheet: newTimeSheet 
 
}; 
 
console.log(JSON.stringify(newObj));