Zibtek Software Developer Interview Questions and Answers

let is block scoped, var is function scoped, const is a constant variable.

• let is block scoped, meaning it is only accessible within the block it is declared in.

• var is function scoped, meaning it is accessible throughout the function it is declared in.

• const is a constant variable whose value cannot be changed once assigned.

The spread operator in JavaScript allows an iterable to be expanded into individual elements.

• The spread operator is denoted by three dots (...) and can be used to expand arrays, objects, or strings.

• It is commonly used for combining arrays, passing arguments to functions, and creating copies of arrays or objects.

• Example: const arr1 = [1, 2, 3]; const arr2 = [...arr1, 4, 5]; // arr2 will be [1, 2, 3, 4, 5]