gistfile1.txt

//1

obj = {key:value};

//2
obj = Object.create(null);
obj[key] = value;

//3
obj = Object.create(null);
Object.defineProperty(obj,"key",{value:value, flags...});
//variante
Object.defineProperties(obj,{key1 : {value:value, flags...}, key2 : {value:value, flags...}});

//4
obj = Object.create(null);
obj.key = value;