JavaScript let Keyword Flash Cards

global variable

A variable accessible throughout the entire program, which can be declared using let.

for loop

In a for loop, variables declared with let are block-scoped and have a new binding for each iteration.

const

Keyword used for constants that should not be reassigned.

variable redeclaration

The act of defining a variable with the same name in the same scope, which is not allowed with let.

What is the global scope in JavaScript?

The global scope in JavaScript refers to the highest level of scope, encompassing the entire program. Variables declared in the global scope are accessible from any part of the code, including functions and blocks.

reassign values

The need to change the value of a variable, for which let is used.

temporal dead zone (TDZ)

The period between entering the scope and the actual declaration of a variable with let, resulting in a ReferenceError if accessed.

let keyword

Used to declare variables in JavaScript.

variable hoisting

Variables declared with let are hoisted to the top of their block scope but remain uninitialized until the declaration statement is encountered.

block-scoped

Variables declared with let are limited to the block in which they are defined which is.

function-scoped

Variables declared with var are limited to the function in which they are defined which is.

mutable variables

Variables that can be reassigned, for which let is used.