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Javascript runtime error let const redeclaration

Interestingly, the script was loaded according to IE9' s developer tools, but the first line was never executed and the error pointed to. However, this ( obviously) wasn' t the thing being redeclared because it' s not even a declaration, let alone a redeclaration! And it only gave me the error for the first const, which was confusing to me, as I tried to remove the variable or add another one to. When you use let or const you are adding an item to the result of LexicallyDeclaredNames, which means they will conflict with the. Using var does not error because LexicallyDeclaredNames does not include var statements. The same variable name occurs as a function parameter and is then redeclared using a let/ var assignment in. Redeclaring the same variable within the same function or block scope using let/ var is not allowed in JavaScript. ES6 does not allow you to do this ( redeclaring a block- scoped variable in the same scope) : let foo; let foo;. And since the console keeps state until you reload the page ( you are in the context of the page after all), the first time. If you move the const foo = ' bar' ; to the top of your script, you won' t see that problem. But once again, if you want that. If you read the exception message, it says " redeclaration of const foo". up vote 0 down vote. I don' t know if this is the best way, but eval will let you get around that: if(!

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  • Video:Runtime redeclaration error

    Error javascript runtime

    And it only gave me the error for the first const, which was confusing to me, as I tried to remove the variable or add another one looks like something quite similar to this post: JS error ' redeclaration' of var when it' s first line in program? Also, you may need to debug into and find out the exact place where the error is thrown, I don' t think IE gives the. The scope of a variable declared with var is its current execution context, which is either the enclosing. As such, let and const declarations throw an error whenever there is another declaration within the same ems like it' s due to spotty implementation of ES6. I still get the error if I remove foo from the function, so the error is coming from the global const declaration. The below code produces the same error, but no error if you.