# Cartesian product of object values (to array)

Let say I have

``````const item = {
"Key1": "Value1",
"Key2": ["Value2", "Value3"]
}
``````

How can I turn it into format as

``````[["Value1","Value2"],["Value1","Value3"]]
``````

?

My way of doing is:

``````let array = [];
for (let i of item.Key2){
array.push([item.Key1,i])
}
``````

Just wondering is there any shorter method? On Best Solutions

``````// What question mentions
const item = {
"Key1": "Value1",
"Key2": ["Value2", "Value3"]
}

let res = item.Key2.map(i => [item.Key1, i])
console.log(res)``````

``````// What the world wants!
const item = {
"Key1": ["ValueA", "ValueB"],
"Key2": ["Value1", "Value2"]
}

res = item.Key1.reduce((acc, i1) => acc.concat(item.Key2.map(i2 => [i1, i2])), [])
console.log(res)`````` On

You could build a cartesian product.

``````const
item = { Key1: "Value1", Key2: ["Value2", "Value3"] },
values = Object.values(item).map(v => [].concat(v)),
result = values.reduce((a, b) => a.reduce((r, v) => r.concat(b.map(w => [].concat(v, w))), []));

console.log(result);`````` On

``````const item = { Key1: "Value1", Key2: ["Value2", "Value3"]};

let target = item.Key2.reduce((i, _) => {
i.push([item.Key1, _]);
return i;
}, []);

console.log(target)``````