bradparker

// Take "3mm", "-3inches", or "3.45 cm" and return ['3', 'mm'], ['-3', 'inches'], ["3.45", "cm"] etc

function unitParse (str) {
  return (str.match(/([-\d.]+)\s+?([A-Za-z]+)/) || []).slice(1)
}

bradparker

|-------------------------|-------------------------|-------------------------|-------------------------|
|-------------------------|-------------------------|-------------------------|-------------------------|
|----7--------8--6--7--10-|----------8-----10-8-----|----7--8--7-----------7--|-------------------------|
|-8-----10-9--------------|-------------------------|-------------10-7--8-----|-10----8--7-----------8--|
|-------------------------|-------------------------|-------------------------|----10-------------------|
|-------------------------|-------------------------|-------------------------|-------------------------|
| +  -  +  -  +  -  +  -  | +  -  +  -  +  -  +  -  | +  -  +  -  +  -  +  -  | +  -  +  -  +  -  +  -  |

|-------------------------|-------------------------|-------------------------|-------------------------|
|-------------------------|-------------------------|----------------9-----7--|-8-----------------------|

bradparker

var context = new AudioContext(), 
    gainNode = context.createGain(), 
    oscillator = context.createOscillator();

gainNode.connect(context.destination);
oscillator.frequency.value = 440;
oscillator.connect(gainNode);
oscillator.start();
// .. 
// gainNode.gain.value = 0;

bradparker

function allInCollection (collection) {
  return function (subCollection) {
    return subCollection.every(function (subItem) {
      return collection.some(function (item) {
        return item.id === subItem.id;
      });
    });
  };
}

bradparker

const range = (start, end) => 
  Array.from({ 
    length: end - start 
  }).map((_, index) => (index + start))
    
const sum = nums => 
  nums.reduce((total, num) => total + num)
  
sum(range(20, 100))

bradparker

function circle (radius, x, y, nPoints) {
  var circle = [];
  var nPoints = nPoints || 360;
  var wedge = 2 * Math.PI / nPoints;

  for (var angle = wedge; angle < 2 * Math.PI; angle += wedge) {  
    circle.push({ 
      x: x + radius * Math.cos(angle), 
      y: y + radius * Math.sin(angle) 
    });