Web Reference: Apr 18, 2009 · Variables declared with let or const remain uninitialized at the beginning of execution while that variables declared with var are being initialized with a value of undefined. Jul 11, 2025 · With the introduction of ES6 in 2015 two more keywords, let and const came into the picture. var and let are both used for variable declaration in javascript but the difference between them is that var is function scoped and let is block scoped. Function Scope Inside a function all variables declared with var, let or const have Function Scope:
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