Typescript map over list of functions

Question

Coming from a Haskell background, I would like to map over a list of functions. For example I have:

functions fnA(x){ return true }
function  fnB(x){ return false }

// I would like to write this code that applies the same value to all functions
[ fnA, fnB ] .map ( (fn : any) => fn('hello world') )

However I am getting error:

(x : any) => boolean' cannot be used as an index type.

Erik van Velzen · Accepted Answer · 2018-06-17 15:37:57Z

3

Prefix the last line with a semicolon:

;[ fnA, fnB ] .map ( (fn : any) => fn('hello world') )

Background: semicolons are optional in Javascript. However there are some edge-cases which require you to apply some style rules.

Starting a line with a bracket [ or parenthesis ( is one of those edge cases.

edited Jun 17, 2018 at 15:37

answered Jun 17, 2018 at 15:26

Erik van Velzen

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