Jumping across platforms

Problem

Level 4-2: a row of platforms over the lava, and the flag on the last. Each one has a number: from there you jump forward anywhere from 1 up to that many platforms, your choice; with a 0 you can't jump.

You get the list of numbers, whole numbers from 0 up, never empty. You start at position 0. Return true if you can reach the last platform and false if you can't; with just one, you are already at the flag.

With [2, 3, 1, 1, 4] you return true: from 0 you jump to 1, and from there to 4. With [3, 2, 1, 0, 4], false: every path ends on the 0 at position 3. Don't try out paths: walk the list keeping track of the farthest you can reach so far.

Examples

• There is a way

  [2, 3, 1, 1, 4] → true

• Every path lands on the 0

  [3, 2, 1, 0, 4] → false

• Already at the flag

  [0] → true

• Stuck from the start

  [0, 1] → false

• A 0 at the goal doesn't matter

  [2, 0, 0] → true

Besides these, the challenge has hidden tests that are revealed when you submit your solution.

You start with this

def can_finish(jumps):
    pass

function canFinish(jumps) {
}