dump.js

/**
 * DUMP
 *
 *	Dumps a variable in a readable form to the console, this is a recursive function
 *	so be careful of nested references that may cause it to overflow... (untested for that)
 *
 *	@v		ANYTHING		[Any variable]
 *	@name		STRING			[The name of the variable, optional, used internally when looping objects and arrays]
 *	@spacing	STRING			[The prefix spacing, used internally when looping objects and arrays]
 */
 var dump = function(v, name, spacing){
	var n;
	// Default the spacing to none (incremented on subsequent calls)
	spacing = spacing || '';
	// If we've been given a name, append a ": "
	name = name ? name + ': ' : '';
	// Figure out the type, fixes for NULL and ARRAY
	var type = typeof v;
	if(type == 'object'){
		if(v === null){
			type = 'null';
		} else if(Object.prototype.toString.call(v) === '[object Array]'){
			type = 'array';
		}
	}
	// Switch the type
	switch(type){
		case 'number':
			console.log(spacing + name + '[Num] ' + v);
			break;
		case 'string':
			console.log(spacing + name + '[Str] ' + v);
			break;
		case 'boolean':
			console.log(spacing + name + '[Boo] ' + v);
			break;
		case 'null':
			console.log(spacing + name + '[Nul] ' + v);
			break;
		case 'undefined':
			console.log(spacing + name + '[Und] ' + v);
			break;
		case 'object':
			console.log(spacing + name + '[Obj] {');
			for(n in v){
				dump(v[n], n, (spacing+'  '));
			}
			console.log(spacing + '}');
			break;
		case 'array':
			console.log(spacing + name + '[Arr] (');
			for(n in v){
				dump(v[n], n, (spacing+'  '));
			}
			console.log(spacing + ')');
			break;
	}
};

example

dump('string');
[Str] string

dump(123);
[Num] 123

dump([ 1, 2, 'a', 'b', null, true, false ]);
[Arr] (
  0: [Num] 1
  1: [Num] 2
  2: [Str] a
  3: [Str] b
  4: [Nul] null
  5: [Boo] true
  6: [Boo] false
)

dump({ 'a': 1, 'b': 2, 'c': null, false: true, 'ar': [ 1, 2, 3, null ] });
[Obj] {
  a: [Num] 1
  b: [Num] 2
  c: [Nul] null
  false: [Boo] true
  ar: [Arr] (
    0: [Num] 1
    1: [Num] 2
    2: [Num] 3
    3: [Nul] null
  )
}

dump(null);
[Nul] null

dump();
[Und] undefined