# `Rexsilient.Retry.Strategy.Exponential`
[🔗](https://github.com/fabiobarkoski/rexsilient/blob/v1.0.0/lib/rexsilient/retry/strategy/exponential.ex#L1)

Doubles the wait after every attempt, up to a maximum.

The wait after attempt `n` is `base_delay * 2 ** (n - 1)`, capped at
`max_delay`: with a `base_delay` of `100`, it waits 100, 200, 400, ...

## Options

  * `:base_delay` - the wait, in milliseconds, after the first attempt.
    Required.

  * `:max_delay` - the longest wait, in milliseconds. Required.

  * `:jitter` - how the wait is randomized, so that callers failing at the
    same time do not retry at the same time. `:none` (the default) uses
    the exact wait, `:full` a random one from `0` to it (see
    `Rexsilient.Jitter.full/3`), and `:equal` a random one from half of it
    to it (see `Rexsilient.Jitter.equal/3`).

## Examples

    strategy Rexsilient.Retry.Strategy.Exponential,
      base_delay: 100,
      max_delay: 5_000,
      jitter: :full

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*Consult [api-reference.md](api-reference.md) for complete listing*