replaceCharacter.js

amit265 · amit265 · commit 9fbcabeb81ae · 2026-04-13T22:11:35.000+05:30
diff --git a/javascript/5_string-programs/replaceCharacter.js b/javascript/5_string-programs/replaceCharacter.js
@@ -0,0 +1,54 @@
+// 15. Replace Characters of a String
+
+// JavaScript Program to Replace Characters of a String
+
+// 1. Using map() & split() method to replace characters from String
+
+{
+  const str = "Hello user, welcome to GeeksforGeeks";
+  let oldWord = "Hello";
+  let newWord = "Hi";
+  const replaceString = str
+    .split(" ")
+    .map((word) => (word === oldWord ? newWord : word))
+    .join(" ");
+  console.log(replaceString);
+}
+
+// Using String replace() Method to replace characters from String
+
+{
+  const str = "Welcome to GFG";
+  const replStr = "GFG";
+  const newStr = "Geeks";
+
+  const updatedStr = str.replace(replStr, newStr);
+
+  console.log(updatedStr);
+}
+
+// Using Regular Expression to replace characters from String
+
+{
+  const str = "Welcome to GeeksforGeeks";
+  const searchString = "Welcome";
+  const replaceString = "Hello";
+  let regex = new RegExp(searchString, "g");
+  let replacedString = str.replace(regex, replaceString);
+  console.log(replacedString);
+}
+
+
+// Using split and join Method to Replace Characters from a String
+
+{
+
+    const str = "welcome to gfg";
+    const oldStr = "gfg";
+    const newStr = "Geeks";
+    const updatedStr = str.split(oldStr).join(newStr)
+
+
+    console.log(updatedStr);
+
+}
