Differences

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--- javascript:substring [2016/07/17 17:29] – created peter
+++ javascript:substring [2020/07/15 09:30] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== JavaScript - SubString ======
-Begin the extraction at position 2, and extract the rest of the string:
+Extract starting at position 2, and extract the rest of the string:
-<code javastring>
+<code javascript>
 var str = "Hello world!";
 var res = str.substring(2);
 </code>
-The result of res will be:
+Result:
-<code javastring>
+<code>
 llo world!
+</code>
+If "start" is greater than "end", it will swap the two arguments:
+<code javascript>
+var str = "Hello world!";
+var res = str.substring(4, 1);
+</code>
+Result:
+<code>
+ell
+</code>
+If "start" is less than 0, it will start extraction from index position 0:
+<code javascript>
+var str = "Hello world!";
+var res = str.substring(-3);
+</code>
+Result:
+<code>
+Hello world!
+</code>
+Extract only the first character:
+<code javascript>
+var str = "Hello world!";
+var res = str.substring(0, 1);
+</code>
+Result:
+<code>
+H
+</code>
+Extract only the last character:
+<code javascript>
+var str = "Hello world!";
+var res = str.substring(11, 12);
+</code>
+Result:
+<code>
+!
 </code>