Call javascript function encoded in a string -

if put function string this:

var functionstring = function (message) {     console.log(message); }.tostring(); 

is there way convert string function , call it? tried

eval(functionstring) 

which returns "uncaught syntaxerror: unexpected token", ,

functionstring.call(this, "hi!"); 

which returns 'undefined not function'.

is possible in javascript?

thanks in advance reply!

edit: point of question function has been converted string using tostring().

console.log(functionstring); 

returns string: "function (message) {console.log(message);}"

can transform string function , call it? that's problem trying solve. thanks!

your functionstring contains string

"function (message) { console.log(message); }"

evaluating as-is present javascript engine incorrect syntax (there no name function). javascript expects construct function <name>(<params>) { }. alternatively, can use anonymous function (i.e. no name present), parameter or in context of evaluating expression. minimal typical evaluating expression (function() {})() if want fancy, !function() {} ok - exclamation mark in front turns boolean expression requires function evaluation before negating output.

so, in example work:

eval("("+functionstring+")('abc')");

because anonymous function call - javascript can live with.

alternatively, can use brackets, need assign result can use later:

var foo = eval("("+functionstring+")"); foo('ddd'); 

here little proof / playground learn it: http://jsfiddle.net/exceeder/ydann6b3/