using slice and reduce together in javascript
//subdivision Array function birthday(s, d, m) { let count = 0 const length = s.length - m for(let i=0;i<=length;i++) { if(s.slice(i,i+m).reduce((a,b) => a+b)=== d) { count++ } } console.log(count) } birthday([1,2,1,3,2],3,2)