Find intersections

findintersections.js

// http://jsbin.com/mapena/edit?js,console
// http://stackoverflow.com/questions/1885557/simplest-code-for-array-intersection-in-javascript
function findIntersctions(a, b) {
    var ai = 0;
    var bi = 0;
    var out = [];
  
    while( ai < a.length && bi < b.length ) {
      
        if( a[ai] > b[bi] ) {
          bi += 1;
        } else if ( a[ai] < b[bi] ) {
          ai += 1;
        } else {
          out.push(a[ai]);
          ai += 1;
          bi += 1;
        }
    }
    
     
    return out;
}