js updates

by Willy-JL , oldip

applications/system/js_app/examples/apps/Scripts/stringutils.js

@@ -0,0 +1,19 @@
+let sampleText = "Hello, World!";
+
+let lengthOfText = "Length of text: " + to_string(sampleText.length);
+print(lengthOfText);
+
+let start = 7;
+let end = 12;
+let substringResult = sampleText.slice(start, end);
+print(substringResult);
+
+let searchStr = "World";
+let result2 = to_string(sampleText.indexOf(searchStr));
+print(result2);
+
+let upperCaseText = "Text in upper case: " + to_upper_case(sampleText);
+print(upperCaseText);
+
+let lowerCaseText = "Text in lower case: " + to_lower_case(sampleText);
+print(lowerCaseText);