Function hoisting means that functions are moved to the top of their scope. That is, function b() { a = 10; return; function a() {} } will be rewritten by the interpeter to this function b() { function a() {} a = 10; return; } Weird, eh? Also, in this instance, function a() {} behaved … Read more
As Stoyan Stefanov explains in “JavaScript Patterns” book, the hoisting is result of JavaScript interpreter implementation. The JS code interpretation performed in two passes. During the first pass, the interpreter processes variable and function declarations. The second pass is the actual code execution step. The interpreter processes function expressions and undeclared variables. Thus, we can … Read more
@thefourtheye is correct in saying that these variables cannot be accessed before they are declared. However, it’s a bit more complicated than that. Are variables declared with let or const not hoisted? What is really going on here? All declarations (var, let, const, function, function*, class) are “hoisted” in JavaScript. This means that if a … Read more