I have problem to use the "if" instruktion in openSCAD. 1) My wish is - if the variable degree0 contains a value (the text eg. bottom), I want the variable deg0 get the value 270.and if the variable degree0 contains a value (the text eg. top), I want the variable deg0 get the value 90 (and so on - the degree0 may contain right / top / left / bottom) Tried a bit, but failed // degree0 = "bottom";degree0 = "top"; // if (degree0 == "bottom") deg0 = 270;// if (degree0 == "top") deg0 = 90; // degree0 = "bottom" ? deg0 = 270;// degree0 = "top" ? deg0 = 90; degree0 = "bottom" ? deg0 = 270  : degree0 = "top" ? deg0 = 90; echo(degree0, deg0); 2)I don't understand how to give variable degree0 the text left (not "left")two examples. degree0 = "left";echo(degree0); or  degree0 = str("left"); echo(degree0); both this give the echo "left" (not left)