Why output is false

Question

var a=[1,2];
var b=[1,2];
document.write(a===b)

Answer 1

Arrays in JavaScript are classified as objects. Objects are compared by reference using == or ===. If two objects points to the same memory location, they are considered equal.
So, in your code sample, since both array a and b are declared and assigned a value, they are not equal even if they have the same array values. They point to two different memory locations.

Answer 2

When you compare objects JS compares their references which are unique to the object if you do a === a you will recieve true because the operands have the same reference.

Answer 3

thank you guys so much help

Answer 4

You could try something like this instead.

function sameArray(arr1, arr2){
if (arr1.length !== arr2.length){
return false;
}
for (var x = 0; x < arr1.length; x++){
if (arr1[x] !== arr2[x]){
return false;
}
}
return true;
}

document.write(sameArray(a, b));