2775. Undefined to Null π
Description
Given a deeply nested object or array obj
, return the object obj
with any undefined
values replaced by null
.
undefined
values are handled differently than null
values when objects are converted to a JSON string using JSON.stringify()
. This function helps ensure serialized data is free of unexpected errors.
Example 1:
Input: obj = {"a": undefined, "b": 3} Output: {"a": null, "b": 3} Explanation: The value for obj.a has been changed from undefined to null
Example 2:
Input: obj = {"a": undefined, "b": ["a", undefined]} Output: {"a": null,"b": ["a", null]} Explanation: The values for obj.a and obj.b[1] have been changed from undefined to null
Constraints:
obj
is a valid JSON object or array2 <= JSON.stringify(obj).length <= 105
Solutions
Solution 1
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