equalArray.js

//compare two distinct array
// check for length and value at each index

function equalArrays(a,b) {
    if (a.length != b.length) return false;
    for(var i = 0; i < a.length; i++)
        if (a[i] !== b[i]) return false;
        return true;
}

var a = ['hello', 'world'],
    b = ['hello', 'world'];

a === b;
/* return false */

equalArrays(a, b);
/* return true */

reference.js

var a = [1];
var b = a;

a == b;

a === b;

/* return true because they refere to the same value */

a[0] = 2;
a[0]; /* 2 */
b[0]; /* 2 */

/* here it's obvious that a and b share the same reference */