从Javascript记录数组中选择随机项并将其转换为数组

Question

How would I randomly select an item from the following Javascript record array, and then take the result and convert it into an array and then select a random item from it?

plot = [
        {
            postcode: "MK1",
            area: "Denbigh, Mount Farm",
        },
        {
            postcode: "MK2",
            area: "Brickfields, Central Bletchley, Fenny Stratford, Water Eaton"
        },
        {
            postcode: "MK3",
            area: "Church Green, Far Bletchley, Old Bletchley, West Bletchley",
        },
        {
            postcode: "MK4",
            area: "Emerson Valley, Furzton, Kingsmead, Shenley Brook End, Snelshall West, Tattenhoe, Tattenhoe Park, Westcroft, Whaddon, Woodhill",
        },
        {
            postcode: "MK5",
            area: "Crownhill, Elfield Park, Grange Farm, Oakhill, Knowlhill, Loughton, Medbourne, Shenley Brook End, Shenley Church End, Shenley Lodge, Shenley Wood",
        }
    ]

For example, if the second item is selected, then from the area field, I want to select one of either "Brickfields, Central Bletchley, Fenny Stratford, Water Eaton" and assign it to a variable.

Answer 1

Function to get random integers where min, max are inclusive

function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

Function to find Random Value from passed variable plot

function getRandomValue(plot)
{
var rN1 = getRandomInt(0,plot.length-1);
var areaArray= plot[rN1].area.split(",");
var rN2 = getRandomInt(0,areaArray.length-1);
return areaArray[rN2];
}

And use it like

plot = [
        {
            postcode: "MK1",
            area: "Denbigh, Mount Farm",
        },
        {
            postcode: "MK2",
            area: "Brickfields, Central Bletchley, Fenny Stratford, Water Eaton"
        },
        {
            postcode: "MK3",
            area: "Church Green, Far Bletchley, Old Bletchley, West Bletchley",
        },
        {
            postcode: "MK4",
            area: "Emerson Valley, Furzton, Kingsmead, Shenley Brook End, Snelshall West, Tattenhoe, Tattenhoe Park, Westcroft, Whaddon, Woodhill",
        },
        {
            postcode: "MK5",
            area: "Crownhill, Elfield Park, Grange Farm, Oakhill, Knowlhill, Loughton, Medbourne, Shenley Brook End, Shenley Church End, Shenley Lodge, Shenley Wood",
        }
    ]

console.log(getRandomValue(plot))