# Typescript Numeric Literal Types X-Y (Subtraction)

We have seen how can we add two numeric literals type

now can we apply similar tricks for subtraction?

yes we can, this is how we do it:

`type CreateArrayWithLengthX<`

LENGTH extends number,

ACC extends unknown[] = [],

> = ACC['length'] extends LENGTH

? ACC

: CreateArrayWithLengthX<LENGTH, [...ACC,1]>

type Subtraction<LARGER extends number, SMALLER extends number, GAP extends number[] = []> =

[...GAP,...CreateArrayWithLengthX<SMALLER>]['length'] extends [...CreateArrayWithLengthX<LARGER>]['length']

? GAP['length']

: Subtraction<LARGER, SMALLER, [1,...GAP]>

type result = Subtraction<849, 654> // 195

limitation: the number cannot exceed 999 because the max depth of TS recursion is only 1000, only work with positive integer