loops - Javascript Control many types with "typeof" without "if" -

i wondering if there alternative classic.

if (typeof firstpost === 'object' && typeof firstpost.active === 'boolean' && typeof firstpost.message === 'string' && typeof firstpost.maxheight) 

so avoid writing more code, maybe looping object.

i use this:

if user input

var firstpost = {     active    : true,     message   : "hello",     maxheight : 20 } 

then:

var checks = {     active    : 'boolean',     message   : 'string',     maxheight : 'number' }  try {     for(var key in checks) {         if(typeof firstpost[key] != checks[key]) {             throw new error(key + " not " + checks[key]);         }     } }catch(e) {     alert(e.tostring()); } 

this not bytesless, it's more clean. (and checks if keys defined)

edit: there no way more compact. can declare function in place , call it.

function checkobject(obj,checks) {     for(var key in checks) {         if(typeof obj[key] != checks[key]) {             return false;         }     }     return true; }  

and simply

checkobject(firstpost,{     active    : 'boolean',     message   : 'string',     maxheight : 'number' }); 

you can elaborate return type in order specify error.