finding quadrant from a array of objects using javascript

Question

i have a variable of which is an array of objects ,and each object is having points. the variable is :

var points = [
 {x: 1, y: 1 }, 
 {x: -1, y: 1 }, 
 {x:         


        

Answer 1

You could use this:

function max_from_quadrant( x, y ) {

    var max_magnitude = 0;
    var maxIndex = -1;

    for ( var i = 0; i < points.length; i++ ) {

      var point = points[i];
      if ( point.x*x < 0 || point.y*y < 0 )
          continue; 

      var magnitude = point.x*point.x + points.y*point.y;

      if ( magnitude > max_magnitude ) {
          max_magnitude = magnitude;
          max_index = i;
      }

    }

    return max_index > -1 ? points[max_index] : false;

}

Just pass in two number arguments with signs that match the quadrant you want to find the maximum in. For your set of points this gives:

max_from_quadrant( -1, -1 ) // {x: -3, y: -1}
max_from_quadrant( -1,  1 ) // {x: -1, y: 11}
max_from_quadrant(  1, -1 ) // {x:  1, y: -2}
max_from_quadrant(  1,  1 ) // {x: 10, y:  1}