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snippets/js/s/starts-with-substring.md

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+---
+title: String starts with substring
+type: snippet
+shortTitle: Starts with substring
+language: javascript
+tags: [string]
+cover: boutique-home-office-3
+author: chalarangelo
+dateModified: 2022-07-31T05:00:00-04:00
+---
+
+Checks if a given string starts 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 beginning.
+- Use `String.prototype.startsWith()` to check the current substring against the `text`.
+- Return the matching substring, if found. Otherwise, return `undefined`.
+
+```js
+const startsWithSubstring = (text, word) => {
+  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', '<br />'); // '/>'
+```