implement string.repeat

dmonad · Apr 22, 2023 · 4538c9f · 4538c9f
1 parent 9866067
commit 4538c9f
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diff --git a/string.js b/string.js
@@ -1,3 +1,5 @@
+import * as array from './array.js'
+
 /**
  * Utility module to work with strings.
  *
@@ -121,3 +123,9 @@ export const decodeUtf8 = utf8TextDecoder ? _decodeUtf8Native : _decodeUtf8Polyf
  * @param {string} insert New content to insert
  */
 export const splice = (str, index, remove, insert = '') => str.slice(0, index) + insert + str.slice(index + remove)
+
+/**
+ * @param {string} source
+ * @param {number} n
+ */
+export const repeat = (source, n) => array.unfold(n, () => source).join('')
diff --git a/string.test.js b/string.test.js
@@ -2,6 +2,15 @@ import * as prng from './prng.js'
 import * as string from './string.js'
 import * as t from './testing.js'
 
+/**
+ * @param {t.TestCase} tc
+ */
+export const testUtilities = tc => {
+  t.assert(string.repeat('1', 3) === '111')
+  t.assert(string.repeat('1', 0) === '')
+  t.assert(string.repeat('1', 1) === '1')
+}
+
 /**
  * @param {t.TestCase} tc
  */