I’m creating a lambda function that executes a second function with a concrete params. This code works in Firefox but not in Chrome, its inspector shows a weird error, Uncaught TypeError: Illegal invocation
. What’s wrong with my code?
var make = function(callback,params){ callback(params); } make(console.log,'it will be accepted!');
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Answer
The console’s log function expects this
to refer to the console (internally). Consider this code which replicates your problem:
var x = {}; x.func = function(){ if(this !== x){ throw new TypeError('Illegal invocation'); } console.log('Hi!'); }; // Works! x.func(); var y = x.func; // Throws error y();
Here is a (silly) example that will work, since it binds this
to console
in your make function:
var make = function(callback,params){ callback.call(console, params); } make(console.log,'it will be accepted!');
This will also work
var make = function(callback,params){ callback(params); } make(console.log.bind(console),'it will be accepted!');