value to test
boolean indicating whether value is object-like and contains a circular reference
var obj = {
'a': 'beep',
'b': {
'c': 'boop'
}
};
obj.b.self = obj;
var bool = isCircular( obj );
// returns true
var arr = [ 1, 2, 3 ];
arr.push( arr );
var bool = isCircular( arr );
// returns true
var bool = isCircular( {} );
// returns false
var bool = isCircular( null );
// returns false
Tests if an object-like value contains a circular reference.