Kotlin val vs var

"val" and "var" are both used to declare variables, but they have different meanings and usage.

"val" is short for "value"

• is used to declare an "immutable" variable, which cannot be reassigned onces it's initialized. (almost same as "final" in Java)
  ex1)

val name = "John"
//name = "Alice" <- error

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"var" is short for "variables"

• is used to declare a "mutable" variable, which can be reassigned after it's initialized.

var age = 35
age = 20