Why Error: Illegal function call? and this library seems very limited unable to call general JS code?

[t829702]

Error: Illegal function call: "Date.UTC(d.year, 0, 1)"

aq.table({ year: [2010, 2011, 2012, 2013, 2019, ] })
  .derive({ date: d => Date.UTC(d.year, 0, 1) })
  .view()

[jheer]

Arquero reparses and optimizes expressions, and for safety and future portability reasons only allows function calls provided by the op object. This is described in the introduction tutorial and formal documentation will later be added to the Arquero docs.

The full documentation for the op object is here: https://uwdata.github.io/arquero/api/op, and includes date-time methods.

[jheer]

Note that you can also register custom op functions using the top-level addFunction method.