https://leetcode.com/problems/jump-game/ (~25%) Could be better

Leetcode: 55. Jump Game

func canJump(nums []int) bool {

    // can-jump cache
    cache := map[int]bool{
        0: true,
    }
    
    var canJump func(int) bool
    canJump = func(to int) bool {
        if canJumpTo, ok := cache[to]; ok {
            return canJumpTo
        }
        for i := 0; i < to; i++ {
            // check can jump from position "i" to "to"
            if i + nums[i] >= to {
                // if so, can you jump to "i"?
                if ok := canJump(i); ok {
                    cache[to] = true
                    return true
                }
            }
        }
        cache[to] = false
        return false
    }
    
    // work backwards from the end
    return canJump(len(nums)-1)
}