Javascript | Odd Array Behavior - Parsing a Combined Array vs a Pre Definied Array -

i'm experiencing odd behavior arrays. don't understand what's happening. if create 2 arrays...

var = [0,0,1,0]; var b = [0,2, 1,2]; 

and combine them...

combinechars(); function combinechars(){    combo.push(a);    combo.push(b); } 

i end array...

combo = [0,0,1,0,0,2,1,2]; 

however, if attempt split array 2 separate arrays doesn't split expected.

function splitarray(a){     console.log("splitarray("+a+")"); //splitarray(0,0,1,0,0,2,1,2)     (i=0;i<a.length;i++){         if ((i+2)%2==0) {             rsplit.push(a[i]);         } else {             csplit.push(a[i]);         }     }     console.log("rsplit = " + rsplit); //rsplit = 0,0,1,0     console.log("csplit = " + csplit); //csplit = 0,2,1,2 } 

expected...

console.log("rsplit = " + rsplit); //rsplit = 0,0,1,0,0,1,0,1 console.log("csplit = " + csplit); //csplit = 0,2,1,2,0,0,2,2 

fiddle: https://jsfiddle.net/taylorrichie/yrzrqm38/4/

as can see fiddle, if create array "co" instead of combining 2 arrays, behaves expected.

???

any appreciated.

richie

given empty combo array, , a , b arrays,

combo.push(a); combo.push(b); 

does not push elements of a , b combo, claim, instead, pushes arrays themselves, making combo array 2 elements, both elements being original a , b arrays themselves.

if use concat instead of push, combo array constructed expected.

i.e. change combinechars function following:

function combinechars(){    combo = combo.concat(a);    combo = combo.concat(b); } 

note need reassign combo, because concat not mutate original array, returns new one.