ES6+ 2차원배열 foreach

const arr = [['a','b','c'],[1,2,3,4,5]];

arr.forEach(

(v,k)=>v.forEach((v2,k2)=>{

console.log("v2,k2: "+v2+' '+k2);

})

);

v2,k2: a 0

v2,k2: b 1

v2,k2: c 2

v2,k2: 1 0

v2,k2: 2 1

v2,k2: 3 2

v2,k2: 4 3

v2,k2: 5 4