Writing a script file to test a function? (Node.js)

Question

I'm currently working on a program where I have a function that runs and does a bunch of things. I wrote a script over the summer at work that could take dummy input and pass it to a function call and then all I had to do was open a command prompt and say node test.js.

Unfortunately I don't remember what that code looked like exactly but I know it was fairly simple.

For simplicity's sake, lets say I have a function:

var double_num = function(num){
    return num*2;
}

contained in a file called double.js

and I also have a blank javascript file test.js. How complicated is it to call double_num from test.js with something in the file like:

var result = double_num(5);
console.log(result);

from the command line using node test.js?

Nick Zuber · Accepted Answer · 2016-11-01 02:57:44Z

1

You would need to export double.js as a module, and then import that module into test.js. Should look something like this:

// double.js

var double_num = function(num){
    return num*2;
}

// export your `double_num` function as a module so 
// we can import this elsewhere in our programs
modules.export = double_num;

And in test.js make sure to include double.js by using its relative path to test.js. Assuming that they're in the same directory, it might look something like this:

// test.js

// Import `double_num` from the file we just exported it from
var double_num = require('./double_num');

var result = double_num(5);
console.log(result);

answered Nov 1, 2016 at 2:57

Nick Zuber

5,6873 gold badges26 silver badges50 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Ryan Over a year ago

thank you! I attempted to upvote this answer but do not have enough reputation for it to display :(. But thank you! @Nick

Nick Zuber Over a year ago

@Ryan Happy I was able to help! You can mark this answer as correct (I believe there is a certain amount of time you need to wait before you can do so, though)

Ryan Over a year ago

Ah! You're right, I marked it correct. Didn't see that checkmark there. (Sorry, major stackoverflow newb).

Collectives™ on Stack Overflow

Writing a script file to test a function? (Node.js)

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related