startsWith.js

amit265 · amit265 · commit 2348a3720907 · 2026-03-15T13:41:26.000+05:30
diff --git a/javascript/5_string-programs/startsWith.js b/javascript/5_string-programs/startsWith.js
@@ -0,0 +1,49 @@
+// 5. Check if a String Starts With Another String
+
+// 1. Using String.startsWith() Method
+
+{
+  let s = "Hello WOrld";
+  let pre = "Hello";
+  if (s.startsWith(pre)) {
+    console.log(`The string starts with '${pre}'`);
+  } else {
+    console.log(`The string does not starts with '${pre}'`);
+  }
+}
+
+// 2. Using String.slice() Method
+
+{
+  let s = "Hello world";
+  let prefix = "Hello";
+  if (s.slice(0, prefix.length) === prefix) {
+    console.log(`The string starts with '${prefix}'`);
+  } else {
+    console.log(`The string does not start with '${prefix}'`);
+  }
+}
+
+// 3. Using String.indexOf() Method
+
+{
+  let s = "Hello World";
+  let prefix = "Hello";
+  if (s.indexOf(prefix) === 0) {
+    console.log(`The string starts with "${prefix}"`);
+  } else {
+    console.log(`The string does not start with '${prefix}'`);
+  }
+}
+
+// 4. Using String.substr() Method
+
+{
+  let s = "Hello World";
+  let prefix = "Hello";
+  if (s.substr(0, prefix.length) === prefix) {
+    console.log(`The string starts with "${prefix}"`);
+  } else {
+    console.log(`The string does not start with '${prefix}'`);
+  }
+}
