How to left pad a string for a new column? about arquero HOT 2 CLOSED

Thanks! Arquero currently lacks padding methods as part of the "built-in" functions, but adding padstart and padend (or similar) would be straightforward. I'll look into adding those soon. In the meantime, your use of the addFunction method is spot on.

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Follow up, I was able to add a utility function to accomplish this:

  aq.addFunction(
    "leftPad",
    (value, times, char) => `${value}`.padStart(times, char)
  );

and use it as follows:

table.derive({
  "fips_state_str": d => op.leftPad(d.fipsstate, 2, "0")
})

Though I'm still curious if this is the recommended approach and if Arquero has a built in method for handling this.

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