javascript array chain code example

Example 1: javascript factor chain

function factorChain(num) {
 let n = num.slice(num.length - 1, num.length)[0]
 return [...Array(n + 1).keys()]
	 .filter(v => n % v === 0)
	 .map((v, i) => v === num[i])[0]
}

Example 2: javascript factor chain

function factorChain (arr) {
	return arr.reduce((a, c, i) => arr[i] % arr[i-1] === 0);
}