Learning Jupyter

Scala closures

A closure is a function. The resultant function value depends on the value of the variable(s) declared outside the function.

We can use this small script to illustrate it:

var factor = 7
val multiplier = (i:Int) => i * factor
val a = multiplier(11)
val b = multiplier(12)

We define a function named multiplier. The function expects an integer argument. For each argument, we take the argument and multiply it by the external variable factor.

We see this result: