String.reserve()

Description

The String reserve() function allows you to allocate a buffer in memory for manipulating Strings.

Syntax

myString.reserve(size)

Parameter Values

  • myString: a variable of type String.
  • size: the number of bytes in memory to save for String manipulation. Allowed data types: unsigned int.

Return Values

  • Nothing

Example Code

String myString; void setup() { Serial.begin(9600); myString.reserve(26); myString = "Arduino"; myString += "GetStarted"; myString += ".com"; // print the String: Serial.println(myString); } void loop() { }

The result on Serial Monitor:

COM6
Send
ArduinoGetStarted.com
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  

※ NOTES AND WARNINGS:

If the string is modified, it is highly recommended using String.reserve() to prevent the memory fragmentation issue

See Also

ARDUINO BUY RECOMMENDATION

Arduino UNO R3
Arduino Starter Kit
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