从 memory node.JS 中删除变量

Question

I know, that, for example, c++ has something like delete variable and it will be deleted from the memory. Is there something like this in JS. For example, I have var canSendRequest = true; and after some operations I want to delete it totally from the memory. As I read, delete canSendRequest will not work properly, but I did not manage to find a properly working way. Does someone know, how to do that?

Answer 1

Since JS is garbage collected, you don't have direct control over the release of memory.

You just have to wait for the runtime to free the memory, which it will if there are no permanent references to it via the global object or a permanently existing closure. In those cases, you need to eliminate such references to the variable so that it qualifies to be freed.

If you're saying you want to eliminate the identifier itself from the scope, you definitely can't unless it was a global that was set as a property of the global object, not using proper variable declaration syntax.

Answer 2

Var is Hoisting type use let or const. like var g_a = 1; //create with var, g_a is a variable delete g_a; //return false console.log(g_a); //g_a is still 1 var g_a = 1; //create with var, g_a is a variable delete g_a; //return false console.log(g_a); //g_a is still 1

now try with let and const