JSFiddle - React, Tailwind, and code Playground
JavaScript
function permutator(inputArr) {
var results = [];
function permute(arr, memo) {
var cur, memo = memo || [];
for (var i = 0; i < arr.length; i++) {
cur = arr.splice(i, 1);
if (arr.length === 0) {
results.push(memo.concat(cur));
}
permute(arr.slice(), memo.concat(cur));
arr.splice(i, 0, cur[0]);
}
return results;
}
return permute(inputArr);
}
function checker(arr, amount, total) {
var add = function (a, b) { return a + b; }
return permutator(arr).map(function(arr) {
var ns = arr.slice(0, amount);
var sum = ns.reduce(add);
return {
n: ns,
t: sum,
e: sum === total
}
});
}
console.log(JSON.stringify(checker([1, 2, 3, 4], 3, 9), null, 2))