I came across a piece of Mongoose code that included a query findOne and then an exec() function. Ive never seen that method in Javascript before? What does it do exactly? Answer Basically when using mongoose, documents can be retrieved using helpers. Every model method that accepts query conditions can be ex…
Tag: node.js
numpy-like package for node [closed]
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 1 year ago. The community reviewed whether to reopen this question 12 days ago and left it closed: Origi…
Using Node.js require vs. ES6 import/export
In a project I am collaborating on, we have two choices on which module system we can use: Importing modules using require, and exporting using module.exports and exports.foo. Importing modules using ES6 import, and exporting using ES6 export Are there any performance benefits to using one over the other? Is …
What’s the most performant way to do simple IP address comparisons?
I’m working in node.js, and I want to do something like the following pseudocode… Any ideas on the fastest way to do this? I’ve already checked out cidr-js, and it provides functionality for CIDR conversions but not IP address comparisons. Seems like node-ip could be a good choice. Thanks! A…
How to automatically zip files with Node.js and npm
Is there a way to automatically zip certain files at the build time with Node.js and npm? For example, I have a project, that file structure looks like this: I want to be able to zip lib folder, certain modules from node_modules and index.js into some zip archive to upload it on the AWS Lambda, for example. I…
Disable Jasmine’s fdescribe() and fit() based on environment
fdescribe() and fit() are great for reducing noise when you’re working on a subset of tests. I sometimes forget to change them back to describe()/it() before merging my branch into master. (It’s okay to have them in separate branch while working on code – i.e. a pre-commit check wouldn’…
How to add custom html attributes in JSX
There are different reasons behind it, but I wonder how to simply add custom attributes to an element in JSX? Answer EDIT: Updated to reflect React 16 Custom attributes are supported natively in React 16. This means that adding a custom attribute to an element is now as simple as adding it to a render functio…
How to copy/move all objects in Amazon S3 from one prefix to other using the AWS SDK for Node.js
How do I copy all objects from one prefix to other? I have tried all possible ways to copy all objects in one shot from one prefix to other, but the only way that seems to work is by looping over a list of objects and copying them one by one. This is really inefficient. If I have hundreds of
Parse XLSX with Node and create json
Ok so I found this really well documented node_module called js-xlsx Question: How can I parse an xlsx to output json? Here is what the excel sheet looks like: In the end the json should look like this: index.js: Answer Improved Version of “Josh Marinacci” answer , it will read beyond Z column (i.…
How to call python script from NodeJs
I need to call this python script in NodeJs. Read.py I used python-shell, here is the NodeJs code for that Test.js But when I ran this code I didn’t see anything in Node side. I think problem occurs when python script comes to this level. Because I just ran with while loop which has only print statement…