break
break is used to exit from a switch-case, for, while, or do-while loop, bypassing the normal loop condition. It is also used to exit from a switch statement.
for (x = 0; x < 255; x++) {
analogWrite(PWMpin, x);
sens = analogRead(sensorPin);
if (sens > threshold) { // bail out on sensor detect
x = 0;
break;
}
delay(50);
}