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