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javascript/snippets/ends-with-substring.md

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+---
+title: String ends with substring
+type: snippet
+shortTitle: Ends with substring
+tags: [string]
+cover: boutique-home-office-4
+author: chalarangelo
+dateModified: 2022-08-01T05:00:00-04:00
+---
+
+Checks if a given string ends with a substring of another string.
+
+- Use a `for...in` loop and `String.prototype.slice()` to get each substring of the given `word`, starting at the end.
+- Use `String.prototype.endsWith()` to check the current substring against the `text`.
+- Return the matching substring, if found. Otherwise, return `undefined`.
+
+```js
+const endsWithSubstring = (text, word) => {
+  for (let i in word) {
+    const substr = word.slice(0, i + 1);
+    if (text.endsWith(substr)) return substr;
+  }
+  return undefined;
+};
+```
+
+```js
+endsWithSubstring('Lorem ipsum dolor sit amet<br /', '<br />'); // '<br /'
+```