Grid column add and delete:
sample-data
random-3x10
random-100x2k
random-1kx200
random-2kx100
addColumn("New Column")
addColumn({"name":"Column id1","id":"id1"})
addColumn(["C1", "C2"])
addColumn(["id1","id2"],"c2")
addColumn("End Sub","end_group")
addColumn("In c1","c1")
addColumn(["In c1 1","In c1 2"],"c1")
deleteColumn("id1")
deleteColumn(0)
deleteColumn(1)
deleteColumn(2)
deleteColumn(-1)
deleteColumn(-2)
deleteColumn([3,5,"id1"])
showColumn(3)
hideColumn(3)
exportData()
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