Function has

Checks if a given path exists within an object.

You can provide the path as a single property key, an array of property keys, or a string representing a deep path.

If the path is an index and the object is an array or an arguments object, the function will verify if the index is valid and within the bounds of the array or arguments object, even if the array or arguments object is sparse (i.e., not all indexes are defined).

const obj = { a: { b: { c: 3 } } };

has(obj, 'a'); // true
has(obj, ['a', 'b']); // true
has(obj, ['a', 'b', 'c']); // true
has(obj, 'a.b.c'); // true
has(obj, 'a.b.d'); // false
has(obj, ['a', 'b', 'c', 'd']); // false
has([], 0); // false
has([1, 2, 3], 2); // true
has([1, 2, 3], 5); // false
Copy