What is the difference between "let" and "var"?

What is the difference between "let" and "var"?

What does "use strict" do in JavaScript, and what is the reasoning behind it?

What does "use strict" do in JavaScript, and what is the reasoning behind it?

Should I use the "for...in" for array iteration a bad idea?

Should I use the "for...in" for array iteration a bad idea?

What is understanding unique keys for array children in React.js

What is understanding unique keys for array children in React.js

What is the difference between state and props in React?

What is the difference between state and props in React?

Write a program for fibonacci series using recursion in php.

Write a program for fibonacci series using recursion in php.

How to filter 1000 of student name in PHP in ascending order.

How to filter 1000 of student name in PHP in ascending order.

how to create queue using two stack in PHP.

how to create queue using two stack in PHP.

What is the preferred way to write this if statement, and why?

What is the preferred way to write this if statement, and why?

What is wrong with this query: "SELECT * FROM table WHERE id = $_POST[ 'id' ]"?

What is wrong with this query: "SELECT * FROM table WHERE id = $_POST[ 'id' ]"?