JsonObjectConst::containsKey()
Description
JsonObjectConst::containsKey()
tests whether a key exists in the object pointed by the JsonObjectConst
.
If the JsonObjectConst
is null, this function returns false
.
Signature
bool containsKey(const char* key) const;
bool containsKey(const String& key) const;
bool containsKey(const std::string& key) const;
bool containsKey(const __FlashStringHelper& key) const;
bool containsKey(std::string_view key) const; // 🆕 (added in 6.18.1)
Arguments
key
: the key to look for.
Return value
JsonObjectConst::containsKey()
returns a bool
that tells whether the key was found or not:
true
if the key is present in the objectfalse
if the key is absent of the object