What is the difference between let and var in Swift programming?

Swift - Interview Questions

‘let,’ and ‘var’ are used to declare the functions in JavaScript. The main difference in both of them is that ‘let’ is block-scoped, whereas ‘var’ is the functional scope. As variable is represented by ‘var,’ and it is defined in the whole program in relation to ‘let.’

Example for defining "var" :

Syntax :

console.log(y);

var y=7;

console.log(y);

Output : undefined 7

Example for defining "let" :

Syntax :

console.log(y);

let x=7; console.l

og(y);

Output : Error