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Showing content from https://arduinojson.org/v6/api/jsonarray/clear/ below:

JsonArray::clear() | ArduinoJson 6

JsonArray::clear() removes all elements from the array pointed by the JsonArray.

If the JsonArray is null/unbound, this function does nothing.

Causes memory leaks ⚠️

Because JsonDocument contains a monotonic allocator, this function cannot release the memory associated with the removed value.
Consequently, you cannot call this function in a loop; otherwise, the JsonDocument will overflow.

Prefer JsonDocument::clear() which doesn’t leak memory.

• JsonDocument::clear()

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