diff --git a/src/itoa.moon b/src/itoa.moon
new file mode 100644
index 0000000..1ed9b24
--- /dev/null
+++ b/src/itoa.moon
@@ -0,0 +1,26 @@
+LOW_BAR = 48 -- '0' in ascii
+
+-- number -> string
+itoa = (n) ->
+  with ret = ""
+    negative = false
+    if n < 0
+      negative = true
+      n = n * -1
+
+    n = math.floor n -- no decimals.
+
+    while true
+      myn = n % 10
+      ret = string.char(myn + LOW_BAR) .. ret
+
+      n = math.floor(n / 10)
+
+      break if n == 0
+
+    ret = "-" .. ret if negative
+
+print itoa 42
+print itoa 420
+print itoa 4200
+print itoa -999