update one field of CDT array

Hi there,

I have one CDT array


{a: 1,

b: "R"


{a: 2,

b: "E"


{a: 3,

b: "R"



what's the good way to update field b from "R" to "T". tried this, it does not work.

a!update(CDT.b, {1, 3}, "T")

anyone has the experience dong this?



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