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Jest Unit Testing Cheatsheet

---

links: home docs

Globals

docs

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import React, { useState, useEffect } from 'react';

/* Custom hook */
function useAPIFetch(apiURL) {
  const [loading, setLoading] = useState(true);
  const [data, setData] = useState(null);

  function fetchData() {
    setLoading(true);
    fetch(apiURL)

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Kafka - Docker Compose

Run docker container in shell

docker exec -it <container id> /bin/sh

Kafka Home

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// In this implementation it is assumed that grid is always 9x9
function sudoku2(grid) {
    // check rows
    for(let row = 0; row < grid.length; row++) {
        const numbersMap = new Set();
        for(let column = 0; column < grid[row].length; column++) {
            if(grid[row][column] === ".") continue;
            if (numbersMap.has(grid[row][column])) {
                return false;
            } else {

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from numpy import unique
from numpy import where
from matplotlib import pyplot
from sklearn.datasets import make_classification
from sklearn.cluster import KMeans

if __name__ == '__main__':
    # initialize the data set we'll work with
    training_data, _ = make_classification(
        n_samples=2000,

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JavaScript Questions

1. What's the output?

function sayHi() {
 console.log(name);

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[mergetool]
    prompt = false
    keepBackup = false
    keepTemporaries = false

[merge]
    tool = winmerge

[mergetool "winmerge"]
    name = WinMerge

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REST Requests using curl

GET:

curl 
  -X "GET" 
  http://localhost:3000/api

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To discard changes in working directory:

git checkout -- < file >

To unstage file:

> git reset HEAD < file >

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var mySingleton = (function () {
 
  // Instance stores a reference to the Singleton
  var instance;
 
  function init() {
 
    // Singleton
 
    // Private methods and variables