The result of [] + {} is the string '[object Object]'. When the + operator is used with non-primitive types, JavaScript first converts them to primitives. An empty array [] converts to an empty string '', and an empty object {} converts to the string '[object Object]', which is the default string representation of a plain JavaScript object. So the expression becomes '' + '[object Object]', resulting in the string '[object Object]'. This demonstrates how the type coercion rules can lead to unexpected results when working with objects and arrays.