Secret one
The JSL If statement is actually a function, and it returns a value.
print( if ( 1 < 2, "yes", "no" ) )
"yes"
If you didn't know that, you might have written
if ( 1 < 2, print("yes"), print( "no" ) )
which also works.
Secret two
The JSL If function needs at least two arguments. It can have more than three! If there is an odd number of arguments, the last one is the otherwise value.
n = 17;
classification = if(
n<3, "toddlers",
n<13, "children",
n<20, "teens",
"adults"
);
show( n, classification );
n = 17;
classification = "teens";
Secret three
The JSL If function handles missing values as neither true or false. The otherwise value is NOT the answer.
n = .;
classification = if(
n<3, "toddlers",
n<13, "children",
n<20, "teens",
"adults"
);
show( n, classification );
n = .;
classification = .;
This can seem quite surprising if you believe two missing values are equal to each other. JMP's comparison operators all return missing if either (or both) operands are missing values. JMP uses the isMissing function to test for missing:
n = .;
classification = if(
isMissing(n), "unknown",
n<3, "toddlers",
n<13, "children",
n<20, "teens",
"adults"
);
show( n, classification );
n = .;
classification = "unknown";
Secret four
There isn't really a secret, it's all on the web.
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