IKG/Rekursion

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Gib die ersten beiden Zeichen eines strings zurück
<code id="4d346eb9efacc">function test(a) {
   return a.substr(0,2);//auch anderen Lösungen können zum gewünschten Ergebnis führen
}
</code>

<run id="4d346eb9efacc">test("Hallo")</run>
<check execute="(test('xxx') == 'xx' && test('bla') == 'bl')">
true
</check>

<canvas>
var x = 50;
var y = 0;
var angle = 45;

var r = 0; var g = 0; var b = 0;
var state = 0;

function baum() {
 angle = angle +45 -5+Math.round(Math.random()*5);
 if (angle > 360) angle = angle -360;
 if (angle < 0) angle = angle +360;
}

function advance(){ 
  if (y >  80) bounce();
  if (y < -80) bounce();
  if (x >  280) bounce();
  if (x < -280) bounce();
  x = x + 10*Math.cos(angle*Math.PI/180); 
  y = y + 10*Math.sin(angle*Math.PI/180); 
  if (state == 0){
   if(r<255){ 
      r++;
      canvas.setColor(r,g,255-r);
   }else{state = 1;}
  }
  if (state == 1){
   if(g<255){ 
      g++;
      canvas.setColor(255-g,g,b);
   }else{state = 2;}
  }
  if (state == 2){
   if(b<255){ 
      b++;
      canvas.setColor(0,255-b,b);
   }else{state = 0; r=0; g=0; b=0;}
  }
}

</run>


canvas.clear();
<run>
for (var i =0; i<200; i++){
 canvas.setWidth(3);
 canvas.ellipse(x+300,y+100,3);
 advance();
}
</canvas>
</run>