Node JS CRUD with MySQL Tutorial Example
Today, node js crud example with mysql is our main topic. i explained simply step by step node.js express mysql crud example. you’ll learn crud operation in node js using express mysql. this example will help you node js crud api with mysql. you will do the following things for node js crud api tutorial. […]
Q. Explain what a callback function is and provide a simple example
A callback the function is a function that is passed to another function as an argument and is executed after some operation has been completed. Below is an example of a simple callback function that logs to the console after some operations have been completed.
Q. Explain arrays in JavaScript
An array is an object that holds values (of any type) not particularly in named properties/keys, but rather in numerically indexed positions:
Q. Explain is Scope in JavaScript?
In JavaScript, each function gets its own scope. The scope is basically a collection of variables as well as the rules for how those variables are accessed by name. Only code inside that function can access that function’s scoped variables. A variable name has to be unique within the same scope. A scope can be nested […]
Q. What is the object type?
The object type refers to a compound value where you can set properties (named locations) that each hold their own values of any type. Bracket notation is also useful if you want to access a property/key but the name is stored in another variable, such as:
Q. What is equality in JavaScript ?
JavaScript has both strict and type–converting comparisons: Some simple equality rules:
Q. What is typeof operator?
JavaScript provides a typeof operator that can examine a value and tell you what type it is:
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