JavaScript · Junior · Question 31 of 75

What does `JSON.stringify({ a: 1, b: undefined, c: () => 1 })` return?

✓Correct answer: '{"a":1}'
2'{"a":1,"b":null,"c":null}'
3TypeError

Explanation

Properties whose values are undefined, functions or symbols are skipped (in arrays they become null). Date becomes a string, Map and Set become {}. Circular references throw an error.

What does `JSON.stringify({ a: 1, b: undefined, c: () => 1 })` return?

Explanation

Further reading

Problem with a question

Test yourself

What does JSON.stringify({ a: 1, b: undefined, c: () => 1 }) return?

Explanation

Further reading

Test yourself

What does `JSON.stringify({ a: 1, b: undefined, c: () => 1 })` return?