Var

Definitions

1. The original variable declaration keyword in JavaScript, which is function-scoped (not block-scoped) and hoisted to the top of its enclosing function. Largely superseded by let and const in modern JavaScript because var's scoping rules are a notorious source of subtle bugs.

   In plain English: The old way to create a variable in JavaScript, now mostly replaced by let and const because it had confusing rules about where the variable was accessible.

   Example: "Our linter auto-fixes every var to let or const — there's no good reason to use var in 2024."

Related Terms

• TypeScript
• Webpack
• Vite
• Node.js
• Scope
• Jest
• Node Module
• Temporal Dead Zone