purescript-record

x_ = SProxy :: SProxy "x"

-- we can get a value out of a field
gotX :: Int
gotX = Record.get x_ { x: 1 }

-- we can insert a value into a record that does not have a field at that label yet
insertedX :: { x :: Int }
insertedX = Record.insert x_ 1 {}

-- we can delete a field from a record at a specific label
deletedX :: {}
deletedX = Record.delete x_ { x: 1 }

-- we can set a new value for a field
setX1 :: { x :: Int }
setX1 = Record.set x_ 1 { x: 0 }

-- we can also modify the type of the field by replacing the contents
setX2 :: { x :: Unit }
setX2 = Record.set x_ unit { x: 0 }

-- we can modify the field value with a function
modifyX :: { x :: Int }
modifyX = Record.modify x_ (\value -> value + 1) { x: 0 }

-- we can also merge two records
mergedXY :: { x :: Int , y :: Int }
mergedXY = Record.merge { x: 1 } { y: 1 }