d3-jsnext/test/arrays/one-time-number.js

d3, but futuristic

require( 'babel/register' );

module.exports = OneTimeNumber;

function OneTimeNumber(value) {
  this.value = value;
}

OneTimeNumber.prototype.valueOf = function() {
  var v = this.value;
  this.value = NaN;
  return v;
};