After reading documentation of underscore.js I found (to my surprise) that actually not all browsers support
methods. Previously I thought that these methods are implemented everywhere. Checking what browsers does not support them, did not give me any information: my chrome, IE9, firefox 13 all supports them.
So where can I find what browsers support them and may be what other methods are not supported everywhere?
P.S I am sorry, I think I confused someone with my question. I know that all browsers support underscore’s foreach. In the question I refer to native methods.
here is a nice compatibility table: http://kangax.github.com/es5-compat-table/