Ryo KuroyanagiI sometimes feel I am forced to use let instead of const in TypeScript even I want to use const to prevent reassignments.
When we use if or switch, there are cases that seems we need to use let. However, we do not have to use let actually.
const fruitNum: number = 0 // a number to represent a type of fruit
let fruitName: string = "Unknown"
switch(fruitNum) {
case 0:
fruitName = "Apple"
break
case 1:
fruitName = "Banana"
break
default:
break
}
Instead of the above code, we may want to use a anonymous function to make fruitName a const.
const fruitNum: number = 0 // a number to represent a type of fruit
const fruitName: string = (() => {
switch(fruitNum) {
case 0:
return "Apple"
case 1:
return "Banana"
default:
return "Unknown"
}
})()
Hope this makes your code more cleaner!
