对象值的笛卡尔积（到数组）

Question

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?

Answer 1

 // 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) 

Answer 2

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); 

Answer 3

 const item = { Key1: "Value1", Key2: ["Value2", "Value3"]}; let target = item.Key2.reduce((i, _) => { i.push([item.Key1, _]); return i; }, []); console.log(target)