checkSubString.js

amit265 · amit265 · commit 3915dd0fdbeb · 2026-04-11T22:04:16.000+05:30
diff --git a/javascript/5_string-programs/checkSubString.js b/javascript/5_string-programs/checkSubString.js
@@ -0,0 +1,30 @@
+// 12. Check Whether a String Contains a Substring
+
+// Using includes() - Most used and Simplest Method
+
+{
+  let s = "abcde";
+  let res = s.includes("bcd");
+
+  console.log(res);
+}
+
+// Using indexOf() - Gives Index of First Occurrence as well
+
+{
+  let s = "Hello, world!";
+  let res = s.indexOf("world") !== -1;
+  console.log(s.indexOf("world"));
+
+  console.log(res);
+}
+
+// Using Regular Expressions (RegExp)
+
+{
+  let s = "Hello, world!";
+  let pat = /world/;
+  let res = pat.test(s);
+
+  console.log(res);
+}
