zeno-check.js

// if an invalidate mechanism is in place
// easings based on expressions might have
// a bit of zeno's paradox, in which the
// value infinitesimally converges to the
// target value

var value = 0;
var nValue = 1;

function animate() {

  requestAnimationFrame( animate );

  // easing
  value += ( nValue - value ) * .1;
  
  // epsilon check
  var epsilon = .001; // can be adjusted, depends on what the value is used for
  if( Math.abs( nValue - value ) < epsilon ) {
    value = nValue;
  } else {
    // draw()
  }
  
}