I am currently developing a lambda function that calls another function with specific parameters. While this code runs without issues in Firefox, it encounters an error in Chrome, displaying a strange message in the inspector:
Uncaught TypeError: Illegal invocationvar execute = function(func, args) {
func(args);
}
execute(console.log, 'it will work!');
When using the console's log function, it is important that this refers to the console internally. The following code simulates a scenario where this may not be the case:
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();
One way to ensure that this points to the console is by using the 'call' method as shown in the example below:
var make = function(callback,params){
callback.call(console, params);
}
make(console.log,'it will be accepted!');
Alternatively, you can achieve the same result by using the 'bind' method as demonstrated in the code snippet below:
var make = function(callback,params){
callback(params);
}
make(console.log.bind(console),'it will be accepted!');
If you're dealing with a function that requires 'this', you can create a new lambda function to encapsulate it and then use it as your callback.
function execute(callback, parameters) {
callback(parameters);
}
execute(function(text){ console.log(text); }, 'This message will be displayed!');
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