The String reserve() function allows you to allocate a buffer in memory for manipulating strings.
string.reserve(size)size: unsigned int declaring the number of bytes in memory to save for string manipulation
None
String myString;
void setup() {
// initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB
}
myString.reserve(26);
myString = "i=";
myString += "1234";
myString += ", is that ok?";
// print the String:
Serial.println(myString);
}
void loop() {
// nothing to do here
}EXAMPLE link: Built-in String Tutorials