Question

I would like to filter an array of items by using the map() function. Here is a code snippet:

var filteredItems = items.map(function(item) {     if( ...some condition... )     {         return item;     } }); 

The problem is that filtered out items still uses space in the array and I would like to completely wipe them out.

My specific code was not intended to run in a browser, so I’m not worried about browser-specific support for either function.

Any idea?

Answer 1

You should use the filter method rather than map unless you want to mutate the items in the array, in addition to filtering.

eg.

var filteredItems = items.filter(function(item) {     return ...some condition...; }); 

[Edit: Of course you could always do sourceArray.filter(...).map(...) to both filter and mutate]