values.js

var outcomes_health ;

function filter_down(indata) {
  const cols = indata.columns;
  let values = {};
  indata.columns.forEach(col => (values[col] = d3.map(indata, d => d[col]).keys()));
  outcomes_health = values['health_outcomes'] ;
}

async function get_values() {
  let data = await d3.csv('https://raw.githubusercontent.com/lennymd/test_evidence_map/main/public/data/column_values.csv');
  filter_down(data) ;
  console.log(outcomes_health) ; // works!
}

get_values() ;
console.log(outcomes_health) ; // runs first--and returns undefined