1. To prevent javascript from checking syntax and issuing errors we create desired string as a comment within a function body:
var foo = function(){/*
blah blah blah
*/};
2. Use built-in "toString()" function to extract this string:
var bar = foo.toString();
But toString() returns everything, not only function body:
"function (){/*blah blah blah/*}"
So, we need to extract only the part we need. I can suggest 2 possible ways:
a) foo.toString().slice(14, -3);
b) foo.toString().split(/\n/).slice(1, -1).join('\n');
if you select the second version, you must start and end your string with new line:
function (){/*
blah
blah blah
*/}
Generic functions:
1)
function heredoc(fn) {
return fn.toString().slice(14, -3);
}
2)
function heredoc(fn) {
return fn.toString().split(/\n/).slice(1, -1).join('\n');
}
There is no difference in performance between these two solutions. I prefer the first one as it looks more simple, and short strings can be written in one line. But it matter of test.
Usage:
var foo = function(){/*
blah
blah blah
*/};
var bar = heredoc(foo);
console.log(bar); // blah
blah blah
------------------------------------------------------------------------------------
Enjoy.
var zzz = function(){/*
var xxx
=
var zzz = function(){/*
var xxx
=
'aaa';*/};var zzz = function(){/*
var xxx = 'aaa';*/};
