Web Reference: Feb 3, 2025 · In JavaScript (and Node.js, which is built on JavaScript), variables can be declared and initialized using several keywords: var, let, and const. Each has its own scope and usage rules. Jul 30, 2015 · What makes the difference between declaration and assignment even clearer is that declaring a variable always creates a new variable within the current scope (scopeB), even if a variable of the same name already existed in a parent scope (scopeA). The var statement declares function-scoped or globally-scoped variables, optionally initializing each to a value.
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