Perhaps my approach is not quite right, so please provide feedback if necessary!
Imagine having an Array that represents some valuable data.
var initial = ['x', 'y'];
var duplicate = initial;
initial.push('z');
console.log(initial === duplicate); // true
I enjoy the fact that both objects remain the same. However, if I were to set initial = ['z'], this would no longer be the case. Is there a way to maintain this connection while performing additional operations on the array?
When it comes to assignments, they can break the link between variables because they operate on references rather than arrays. This means the variable being assigned will now point to a different location. Any changes made after the assignment will be visible through both the original and the new variable:
newVar.length = 5; // visible through original
newVar[3] = 4; // visible through original
newVar.pop(); // visible through original
If you want to maintain the link between variables after an assignment, consider using a different operation that achieves a similar result, such as copying the contents of one array into another.
By the way, it's misleading to name the new variable "copy" since it's not actually a copy, but rather the original array, just like the original variable is.
It is recommended to utilize inheritance in your code:
function inheritTraits(base, extended)
{
for ( var trait in base )
{
try
{
extended[trait] = base[trait];
}
catch( error ){}
}
}
Next, do the following:
var source = ['x', 'y'];
var replica=[]; inheritTraits(source, replica) //NOT : var copy = orignal;
source.push('z');
console.log(source === replica); // false
DEMONSTRATION : http://jsfiddle.net/abdennour/e64vB/1/
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