src/Pivot.js
function get(k, key, value, fields) {
  return accessor(
    function(d) { return key(d) === k ? value(d) : NaN; },
    fields,
    k + ''
  );
}
function get(k, key, value, fields) {
  return accessor(
    function(d) { return key(d) === k ? value(d) : NaN; },
    fields,
    k + ''
  );
}
function get ( k , key , value , fields ) { return accessor ( function ( d ) { return key ( d ) === k ? value ( d ) : NaN ; } , fields , k + '' ) ; }
Generate aggregate field accessor. Output NaN for non-existent values; aggregator will ignore!
Generate aggregate field accessor . Output NaN for non - existent values ; aggregator will ignore!