Circle to Circle collision function Javascript

Question

I wrote a circle to circle collision function but I think I made a little mistake and I can't see to find it.

 function testCollisionArc(arc1,arc2){ return arc1.x + arc1.r + arc2.r > arc2.x && arc1.x < arc2.x + arc1.r + arc2.r && arc1.y + arc1.r + arc2.r > arc2.y && arc1.y < arc2.y + arc1.r + arc2.r }

Answer 1

A circle hasnt edges and borders ( :0 ). You need to get the distance between both:

var distance=Math.sqrt(Math.pow(arc1.x-arc2.x,2)+Math.pow(arc1.y-arc2.y,2));//the 'sentence of Pythagoras' as we say in German
return arc1.r+arc2.r>distance;