String.startsWith()

Description

Teste si un objet String commence avec les caractères d'un autre objet String.

Syntaxe

string.startsWith(string2)

Paramètres

  • string: une variable de type String()
  • string2: une autre variable de type String()

Valeurs Renvoyées

  • true: si l'objet string commence par les caractères de l'objet string2
  • false: dans le cas contraire

Exemple

void setup() { Serial.begin(9600); String myString = "ArduinoGetStarted.com"; String myString2 = "Arduino"; if (myString.startsWith(myString2)) Serial.println("The string is started with Arduino"); else Serial.println("The string is NOT started with Arduino"); } void loop() { }

The result on Serial Monitor:

COM6
Send
The string is started with Arduino
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  

※ Remarque:

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

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