Скачать или смотреть Block-Scoped Variables in Node.js: Using let

In Node.js, let is used to declare block-scoped variables, providing more flexible and predictable scoping compared to var. Introduced in ECMAScript 2015, let ensures variables are confined to the block where they are defined, such as within a loop or a conditional statement. This prevents issues related to variable hoisting and redeclaration. Unlike var, let variables are not initialized to undefined and cannot be accessed before their declaration in the code. Additionally, let allows for the creation of mutable variables that can be reassigned new values within their scope, enhancing control over variable management.

This code example demonstrates the use of let in Node.js to declare block-scoped variables. It includes a function that shows how let confines variables to block scope within an if statement and a for loop. The example highlights the difference in behavior compared to var, ensuring variables do not leak outside their intended scope.

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