Global variables can be accessed from anywhere in a JavaScript program. Variables declared with var, let and const are quite similar when declared outside a block.

Is it possible to define a global variable in a JavaScript function? I want use the trailimage variable (declared in the makeObj function) in other functions.

Jul 23, 2025 · Var keyword is used to declare variables globally. Global variables can be accessed from any part of the program. Note: If you assign a value to a variable and forgot to declare that variable, it …

Nov 25, 2025 · What Is a Global Variable in JavaScript? A global variable in JavaScript is any variable declared outside of a function that becomes accessible throughout your entire codebase. When you …

Read the tutorial and learn how to define a global variable in a JavaScript function. Also, read about the differences about the global and local variables.

Sep 19, 2025 · Related video about how to declare global variable in javascript This video complements the article information with a practical visual demonstration.

Jul 25, 2025 · Explore various ways to declare global variables in JavaScript, from traditional 'var' to modern 'globalThis' and module scope, with code examples and best practices.

Mar 11, 2025 · This tutorial introduces how to declare global variables in JavaScript, explaining various methods including using var, let, and const. Learn the implications of global variables and best …