From a124ce50bb152b101631e522de8013ab52cceb2a Mon Sep 17 00:00:00 2001
From: Simon Sinclair <simon@simonsinclair.com>
Date: Tue, 13 Jul 2021 23:15:54 +0100
Subject: [PATCH 1/5] Add getSymbolValue

---
 src/index.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/index.ts b/src/index.ts
index 2ab0505..f6f3d37 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -6,6 +6,10 @@ export const getSymbol = (index: number): string => {
   return SYMBOLS.charAt(index);
 };
 
+export const getSymbolValue = (symbol: string): number => {
+  return '0123456789abcdefghjkmnpqrstvwxyz'.search(symbol);
+};
+
 const n32 = (number: number): string => {
   if (number < 0) throw new Error('n32 expects an absolute number.');
   if (number < 32) return getSymbol(number);

From 8e972637320c11abd53c0af25669b3552d5d0e26 Mon Sep 17 00:00:00 2001
From: Simon Sinclair <simon@simonsinclair.com>
Date: Tue, 13 Jul 2021 23:16:07 +0100
Subject: [PATCH 2/5] Add n32decode

---
 src/index.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/index.ts b/src/index.ts
index f6f3d37..afdb88b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -26,4 +26,18 @@ const n32 = (number: number): string => {
   return m;
 };
 
+export const n32decode = (n32: string): number => {
+  const BASE = 32;
+  let n = n32.length;
+  let s = 0;
+
+  while (n > 0) {
+    n--;
+    const symbol = n32[n32.length - n - 1];
+    s = getSymbolValue(symbol) * BASE ** n + s;
+  }
+
+  return s;
+};
+
 export default n32;

From a2fd5a6d1b58d6b3049b9ed49a6598bc88188dc2 Mon Sep 17 00:00:00 2001
From: Simon Sinclair <simon@simonsinclair.com>
Date: Tue, 13 Jul 2021 23:16:55 +0100
Subject: [PATCH 3/5] Expand n32 value string assertions

---
 __tests__/index.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/__tests__/index.ts b/__tests__/index.ts
index 2316831..414b7ab 100644
--- a/__tests__/index.ts
+++ b/__tests__/index.ts
@@ -5,6 +5,7 @@ describe('n32', () => {
     expect(n32(0)).toBe('0');
     expect(n32(31)).toBe('z');
     expect(n32(32)).toBe('10');
+    expect(n32(1035280)).toBe('zk0g');
     expect(n32(Number.MAX_SAFE_INTEGER)).toBe('7zzzzzzzzzz');
   });
   it('throws an error', () => {

From a51422cee5a8875ab505321b55c389be30d3bf38 Mon Sep 17 00:00:00 2001
From: Simon Sinclair <simon@simonsinclair.com>
Date: Tue, 13 Jul 2021 23:18:09 +0100
Subject: [PATCH 4/5] Add getSymbolValue test suite

---
 __tests__/index.ts | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/__tests__/index.ts b/__tests__/index.ts
index 414b7ab..07569e6 100644
--- a/__tests__/index.ts
+++ b/__tests__/index.ts
@@ -1,4 +1,4 @@
-import n32, { getSymbol } from '../dist';
+import n32, { n32decode, getSymbol, getSymbolValue } from '../dist';
 
 describe('n32', () => {
   it('returns a valid string', () => {
@@ -26,3 +26,12 @@ describe('getSymbol', () => {
     );
   });
 });
+
+describe('getSymbolValue', () => {
+  it('returns a valid symbol value', () => {
+    expect(getSymbolValue('0')).toBe(0);
+    expect(getSymbolValue('9')).toBe(9);
+    expect(getSymbolValue('a')).toBe(10);
+    expect(getSymbolValue('z')).toBe(31);
+  });
+});

From 8b6316bebbbc1eb8f744b5dcabca46e8ac4e3ea6 Mon Sep 17 00:00:00 2001
From: Simon Sinclair <simon@simonsinclair.com>
Date: Tue, 13 Jul 2021 23:18:20 +0100
Subject: [PATCH 5/5] Add n32decode test suite

---
 __tests__/index.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/__tests__/index.ts b/__tests__/index.ts
index 07569e6..bdb4a62 100644
--- a/__tests__/index.ts
+++ b/__tests__/index.ts
@@ -13,6 +13,16 @@ describe('n32', () => {
   });
 });
 
+describe('n32decode', () => {
+  it('returns a valid number', () => {
+    expect(n32decode('0')).toBe(0);
+    expect(n32decode('z')).toBe(31);
+    expect(n32decode('10')).toBe(32);
+    expect(n32decode('0zk0g')).toBe(1035280);
+    expect(n32decode('7zzzzzzzzzz')).toBe(Number.MAX_SAFE_INTEGER);
+  });
+});
+
 describe('getSymbol', () => {
   it('returns a valid symbol', () => {
     expect(getSymbol(0)).toBe('0');