![]() One of the main issues is that var has function scope, not block scope, which means that variables declared with var are accessible anywhere within the function, even outside of blocks. Var is the old way of declaring variables in JavaScript, and it has some quirks that can lead to hard-to-debug issues. Let, var, and const are all ways to declare variables in JavaScript, but they have some important differences. What is the difference between let, var, and const in JavaScript? How would you declare and use an arrow function in JavaScript? What is the difference between = and = in JavaScript? How would you reverse a string in JavaScript? What is a closure in JavaScript? What is the this keyword in JavaScript? What is the difference between synchronous and asynchronous code in JavaScript? What is a promise in JavaScript? What is a callback function in JavaScript? How would you check if a variable is an array in JavaScript? What is the difference between let, var, and const in JavaScript?
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