Archive for October, 2009
There’s no such thing unfortunately, but it’s easy to replicate the same behaviour since we’ve got a handy cross-browser method called slice.
So what does the slice method do ? It allows up to two parameters to be passed in, start index and end index. If none are sent in the slice method will return a COPY of the original array, which allows us to use it as if it were a clone method. If only the first parameter is specified it will assume the full length of the array as secondary parameter. Not specifying a value will as earlier mentioned behave the same as this:
var copiedArray = theArray.slice( 0, theArray.length ); //this results in the same var copiedArray = theArray.slice();
var sourceArray = [1,2,3,4,5], clonedArray = sourceArray.slice(); alert(sourceArray.slice(1)); //will return & alert a copied array with the values 2,3,4,5 at indexes 1,2,3,4 alert(sourceArray.slice(1,2)); //will return & alert a copied array with the value 2 at index 0 sourceArray = sourceArray.slice(1,4); //sourceArray will now contain 2,3,4 alert(clonedArray); //will still alert 1,2,3,4,5 since it's a copy of the original array and not a reference.