string additions completed.

Author: EhsanZB

02-Part II - ES2015 features/09-String additions/notes.md

@@ -0,0 +1,72 @@
+## String additions
+
+```js
+// ES5 example
+var title1 = 'Red Rising.';
+if (title1.indexOf('Red' === 0)) {
+	console.log('existed!');
+}
+```
+
+* ES6 new string methods:
+
+    * .includes()
+    * .startsWith()
+    * .endsWith()
+    * .repeat()
+
+#### .includes()
+
+```js
+let title2 = 'Red Rising.';
+if (title2.includes('ising')) {
+	console.log('existed!');
+}else{
+	console.log('NOT existed!');
+}
+```
+
+#### .startsWith()
+
+```js
+let title = 'Red Rising.';
+if (title.startsWith('Ri',4)) { // the second arg is optional and it shows the start index - position -  (note that it's CASE-SENSITIVE )
+	console.log('existed!');
+}else{
+	console.log('NOT existed!');
+}
+```
+
+#### .endsWith()
+
+```js
+let title3 = 'Red Rising.';
+if (title3.endsWith('ing.')) {
+	console.log('existed!');
+}else{
+	console.log('NOT existed!');
+}
+```
+
+#### .repeat()
+
+```js
+let str = 'lol';
+console.log(str.repeat(5)); // lollollollollol
+
+let str1 = 'Hello';
+let str2 = 'o';
+console.log(
+	// str1 + str2.repeat(10) + '.'
+	`${str1}${str2.repeat(10)}.` // Hellooooooooooo.
+);
+```
+
+* another example
+
+```js
+let heading = 'This heading is here';
+console.log(
+	`${'=>'.repeat(5)} ${heading} ${'<='.repeat(5)}` // =>=>=>=>=> This heading is here <=<=<=<=<=
+)
+```

README.md

@@ -53,7 +53,7 @@ Other useful references:
 06. Classes
 07. Modules
 08. Promises
-09. String additions (_in progress_)
+09. String additions
 10. Array additions (_in progress_)
 11. Generators (_in progress_)
 12. Sets (_in progress_)