How can I create every combination possible for the contents of two arrays?

Question

I have two arrays:

var array1=[\"A\",\"B\",\"C\"];

var array2=[\"1\",\"2\",\"3\"];

How can I set another array to contain every combinatio

Answer 1

Here is functional programming ES6 solution:

var array1=["A","B","C"];
var array2=["1","2","3"];

var result = array1.reduce( (a, v) =>
    [...a, ...array2.map(x=>v+x)],
[]);
/*---------OR--------------*/
var result1 = array1.reduce( (a, v, i) =>
    a.concat(array2.map( w => v + w )),
[]);

/*-------------OR(without arrow function)---------------*/
var result2 = array1.reduce(function(a, v, i) {
    a = a.concat(array2.map(function(w){
      return v + w
    }));
    return a;
    },[]
);

console.log(result);
console.log(result1);
console.log(result2)