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The JavaScript, Node.js, and SQL online test assesses candidates' knowledge of programming in the JavaScript language, specific Node.js features, and their ability to use SQL.
It's an ideal test for pre-employment screening. A good Node.js developer needs to be able not only to solve problems using Node.js but also to write and analyze SQL queries to access a database.
This online test requires candidates to solve coding problems and find and fix bugs in multiple technologies.
Implement the ensure function so that it throws an error if called without arguments or the argument is undefined. Otherwise it should return the given value.
Consider the following package.json for a Node.js application:
{
"name": "skill-measure-app",
"private": true,
"version": "1.0.0",
"main": "lib/main.js",
"scripts": {
"build": "npm run cleanup & npm run test & npm run publish",
"cleanup": "rm -fr ./lib",
"test": "jest",
"publish": "npm publish lib"
},
"dependencies": {
"jest": "^23.0.1",
"custom-package": "file:../custom-package"
}
}
Select all the correct statements.
Given the following data definition, write a query that returns the number of students whose first name is John.
TABLE students id INTEGER PRIMARY KEY, firstName VARCHAR(30) NOT NULL, lastName VARCHAR(30) NOT NULL
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