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-rw-r--r--src/dice.js38
1 files changed, 38 insertions, 0 deletions
diff --git a/src/dice.js b/src/dice.js
index 6f3b7da..ef67edf 100644
--- a/src/dice.js
+++ b/src/dice.js
@@ -111,6 +111,43 @@ const keepLow = (die1, die2) => {
}
}
+const again = (die1, die2) => {
+ return () => {
+ const againOn = roll(die1)
+ let rolls = []
+ let rollAgain = []
+
+ const rollDie = (die) => {
+ const roll = die()
+
+ if (roll >= againOn) {
+ rollAgain.push(die)
+ }
+
+ let returnedOriginal = false
+ rolls.push(() => {
+ if (!returnedOriginal) {
+ returnedOriginal = true
+ return roll
+ } else {
+ return die()
+ }
+ })
+ }
+
+ die2().forEach(rollDie)
+
+ while (rollAgain.length > 0) {
+ const oldRollAgain = rollAgain
+ rollAgain = []
+ oldRollAgain.forEach(rollDie)
+ }
+
+ return rolls
+ }
+}
+
+
exports.pool = pool
exports.roll = roll
exports.constant = constant
@@ -123,3 +160,4 @@ exports.negative = negative
exports.explode = explode
exports.keepHigh = keepHigh
exports.keepLow = keepLow
+exports.again = again