Reflect.deleteProperty

Reflect.deleteProperty(target, propertyKey)

var obj = { x: 1, y: 2 };
Reflect.deleteProperty(obj, 'x' // true
obj; // { y: 2 }

var arr = [1, 2, 3, 4, 5];
Reflect.deleteProperty(arr, '3' // true
arr; // [1, 2, 3, , 5]

// Returns true if no such property exists
Reflect.deleteProperty{}, 'foo' // true

// Returns false if a property is unconfigurable
Reflect.deleteProperty(Object.freeze{foo: 1}), 'foo' // false