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+---
+title: String ends with substring
+shortTitle: Ends with substring
+tags: string
+expertise: beginner
+cover: blog_images/boutique-home-office-4.jpg
+author: chalarangelo
+firstSeen: 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
'); // '
{
+ for (let i in word) {
+ const substr = word.slice(-i - 1);
+ if (text.startsWith(substr)) return substr;
+ }
+ return undefined;
+};
+```
+
+```js
+startsWithSubstring('/>Lorem ipsum dolor sit amet', '
'); // '/>'
+```