JavaScript

Replace \t with a tab to get the posted character count.

Standard (63 characters)

eval(eval("'<code here>'".replace(/\t */g,function(s){return"\\"+s.length})))

Version 1.8 (55 characters)

eval(eval("'<code here>'".replace(/\t */g,function(s)"\\"+s.length)))

Encoder program for both

for(var i = 0, si = prompt("Enter the code."), so = ""; i < si.length; ++i) so += '\t' + Array(+si.charCodeAt(i).toString(8)).join(' '); prompt("Here is the result.", so);

JavaScript

Replace \t with a tab to get the posted character count.

Standard (64 characters)

eval(eval("'<code here>'".replace(/\t */g,function(s){return"\\"+s.length})))

Arrow function (49 characters)

eval(eval("'<code here>'".replace(/\t */g,(s)=>"\\"+s.length)))

Encoder program for both

for(var i = 0, si = prompt("Enter the code."), so = ""; i < si.length; ++i) so += '\t' + Array(+si.charCodeAt(i).toString(8)).join(' '); prompt("Here is the result.", so);

JavaScript (71 characters)

eval("<code here>".replace(/\t */g,function(s){return String.fromCharCode(s.length)}))

Replace \t with a tab to get the posted character count.

Corresponding encoder program:

for(var i = 0, si = prompt("Enter code"), so = ""; i < si.length; ++i) so += '\t' + Array(si.charCodeAt(i)).join(' '); prompt("Here is the result", so);

JavaScript

Replace \t with a tab to get the posted character count.

Standard (63 characters)

eval(eval("'<code here>'".replace(/\t */g,function(s){return"\\"+s.length})))

Version 1.8 (55 characters)

eval(eval("'<code here>'".replace(/\t */g,function(s)"\\"+s.length)))

Encoder program for both

for(var i = 0, si = prompt("Enter the code."), so = ""; i < si.length; ++i) so += '\t' + Array(+si.charCodeAt(i).toString(8)).join(' '); prompt("Here is the result.", so);