Sorry that example code was gibberish. I'm so used to being able to edit
posts I make (and use syntax highlighting) that I'm very sloppy. The
correct example code was:
function buildIfStatement(test, consequent, alternate) {
return {
type: 'IfStatement',
prop1: test,
prop2: consequent,
prop3: alternate,
prop4: null,
prop5: null,
}
}
But actually I think it was utterly pointless code as it misunderstands the
real impact of the problem. Ast-handling code tends to look like:
function print() {
switch(node.type) { // <-- only this access is needlessly megamorphic
case 'IfStatement': return 'if (' + node.test + ')' + ... // <-- this
access is monomorphic
}
}
Thus while there is megamorphism it is not likely to be dominant in the
total costs of real execution.
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