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[yaffs-website] / vendor / jcalderonzumba / gastonjs / docs / api / commands / javascript / evaluate.md

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+evaluate
+========
+Command to evaluate javascript code within the current page you are browsing.
+
+##Example of use
+####Request
+```json
+{
+    "name": "evaluate",
+    "args": [
+        "(function (fibonnaciNumber) {\n  var looping = function (n) {\n    var a = 0, b = 1, f = 1;\n    for (var i = 2; i <= n; i++) {\n      f = a + b;\n      a = b;\n      b = f;\n    }\n    return f;\n  };\n  return looping(fibonnaciNumber);\n})(10);\n"
+    ]
+}
+```
+####Response
+If there are no javascript errors then the response should be the result of the evaluation of the code, in this case:
+```json
+{
+    "response": 55
+}
+```
+##Rule of thumb for javascript code
+As a recommendation try always to make your code like this:
+```javascript
+(function () {
+  //Here should go all the code you want to evaluate
+  return value;
+})();
+```