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Re:How to write PureScript react components to replace JavaS... by TexInWien on Thursday June 25, 2020 @10:33AM (#23641184)
The following line defines a function (the syntax is known as an 'operator section'):

  (_ + 1)
Equivalent to this JS function:

  x => x + 1
Operator Sections: https://github.com/purescript/documentation/blob/master/lang...
Re:How to write PureScript react components to replace JavaS... by rkangel on Thursday June 25, 2020 @10:40AM (#23641268)
I think the parent's point is that it only includes increment and not decrement.