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function depthAt( x:Number, y:Number, N:Number ):Number { return x+y < N ? (x+y)*(x+y+1)/2 + y : N*N-1-depthAt(N-1-x,N-1-y,N); }

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public static function getColorFromString(color:String):int
    return parseInt(color.split("#")[1],16);
}

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public static function getColorFromString(color:String):int
{
    return parseInt(new RegExp(/[0-9a-fA-F]{6}/).exec(color),16);
...

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public static function getColorFromString(color:String):int
{
    // Convert '#' to '0x'. Everything starting with '0x' is interpreted by AS automatically as a hex number.
...