Given a string like "this is a search with spaces", I want to return all permutations of that string where the spaces are replaced with a dash. For example, this is the result that I want:
["this-is-a-search-with-spaces"]
["this-is-a-search-with", "spaces"]
["this", "is-a-search-with-spaces"]
["this-is", "a-search-with-spaces"]
["this-is-a-search", "with-spaces"]
["this-is-a", "search-with-spaces"]
...and so on.
I can do half of this, but the problem is that it matches ["query1-query2", "query3"] but not the opposite way around like ["query1", "query2-query3"].
This is my current code:
const sliced = query.split(/ +/g)
let permutations = []
for (let i = 1; i <= sliced.length; i++) {
let permuteArr = []
for (let j = 0; j < sliced.length; j+=i) {
permuteArr.push(sliced.slice(j, j+i).join("-"))
}
permutations.push(permuteArr)
}
Thanks for helping me.
Here is a recursive generator that yields the combinations:
function permutations(query) {
function* iterRecur(sliced) {
if (sliced.length == 1) return yield sliced;
for (const result of iterRecur(sliced.slice(1))) {
yield [sliced[0] + "-" + result[0], ...result.slice(1)];
yield [sliced[0], ...result];
}
}
const sliced = query.split(/ +/g);
return [...iterRecur(sliced)];
}
console.log(permutations("this is a test"));