FASERIP API - Anyone wanna help me understand and expand this script?

Forgot about the var, let, const question.   const = a constantly defined variable that cannot be changed or updated.  Is this global or just within its block {} scope? var = a variable that can be changed, updated and re-declared at a global level. let = a variable that can only be declared once within its block {} scope, but can be updated with said block {} scope. correct?

rcbricker said: Forgot about the var, let, const question.   const = a constantly defined variable that cannot be changed or updated.  Is this global or just within its block {} scope? var = a variable that can be changed, updated and re-declared at a global level. let = a variable that can only be declared once within its block {} scope, but can be updated with said block {} scope. correct? const and let are both within the block scope, whereas var is hoisted to the start of the function. Note: this only applies to initialisations, not declarations. If you do var x; that will be hosited, but if you do var x = 7; that will not be hoisted. The first is an initialisation , the latter is a declaration . For const and let, initialisations and declarations are both treated the same way - as declarations. Note that you can declare let multiple times, but each becomes a separation instance. You can do this: let x = 7; if(x===7) {     let x = 5; x = x +4; } console.info({x}); The console output will show x = 7. If the x created inside the if block is a completely separate variable from the x created at the start of the code.

GiGs said: const and let are both within the block scope, whereas var is hoisted to the start of the function. Note: this only applies to initialisations, not declarations. If you do var x; that will be hosited, but if you do var x = 7; that will not be hoisted. The first is an initialisation , the latter is a declaration . I think you have those backwards, GiGs... the declaration is introducing the new thing ( var x , your first example). Initialization (or, initialisation, if you simply must) would be to give it its first value ( var x = 7 ). To put a fine point on it, though, the second example is both declaring and initializing the variable. The declaration is hoisted, but the initialized value is not: console.log(x); // undefined var x = "hoocha hoocha hoocha, lobster"; console.log(x); // "hoocha, hoocha, hoocha, lobster" Compare that to the same three statements, but replacing var with let. You'll get a "can't reference 'x' before initialization" error.

Well spotted, I used the initialisation and declaration times in the wrong order. Declaration: you declare that this variable exists. Initialisation: you give it a value (initialise it).