I have a function which is part of an object called server, i.e server.log is a function which I use to log data. There are other properties of server which I do not want to pass to other functions, though I want server.log to be available to functions in other files.

function test() {
    testingThis(server.log);
}

function testingThis(logf) {
    logf("test123");
}

I get an error saying

Cannot read property 'emit' of undefined

I am using happy console module to log (server.log works fine in test function).

I have a function which is part of an object called server, i.e server.log is a function which I use to log data. There are other properties of server which I do not want to pass to other functions, though I want server.log to be available to functions in other files.

function test() {
    testingThis(server.log);
}

function testingThis(logf) {
    logf("test123");
}

I get an error saying

Cannot read property 'emit' of undefined

I am using happy console module to log (server.log works fine in test function).

• javascript
• node.js

Share Improve this question Follow edited Jul 23, 2015 at 20:23 depperm 10.8k44 gold badges4646 silver badges6868 bronze badges asked Jul 23, 2015 at 20:21 user1692342user1692342 5,2471313 gold badges7979 silver badges138138 bronze badges

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1 Answer 1

Sorted by: Reset to default 9

Presumably server.log expects this to refer to server. However, the way you call the function, this refers to the global object or undefined (in strict mode).

Bind the function to server:

testingThis(server.log.bind(server));

See also How to access the correct `this` context inside a callback?.