Hex check (#8)

* update jest lib

* adding increment and toHexNonce methods and tests, adding more readme

* adding 0x check

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@beamnetwork/nonce-2d",
-  "version": "0.0.5",
+  "version": "0.0.6",
   "description": "",
   "main": "./dist/index.js",
   "module": "./dist/index.mjs",

src/index.ts

@@ -32,6 +32,7 @@ export class Nonce2D {
   private _address: string
 
   private constructor(hexNonce2D: string) {
+    hexNonce2D = include0x(hexNonce2D)
     const { key, chain, address } = this.getKeyHex(BigInt(hexNonce2D))
     this._key = key
     this._chain = chain
@@ -192,6 +193,18 @@ function stripOx(hex: string): string {
   return hex
 }
 
+/**
+ * helper function to include the 0x prefix in a hex string
+ * @param hex the hex string to include the 0x prefix
+ * @returns
+ */
+function include0x(hex: string): string {
+  if (!hex.startsWith('0x')) {
+    return '0x' + hex
+  }
+  return hex
+}
+
 /**
  * Helper function to padd a string with leading 0s
  * @param hexInput string to pad

test/index.spec.ts

@@ -90,6 +90,12 @@ describe('Nonce2D tests', () => {
       expect(n.toHexNonce()).toBe(testsHexNonce)
     })
 
+    it('should support lack of 0x infrom of string', () => {
+      const missing = testsHexNonce.substring(2)
+      const n = Nonce2D.fromHexNonce(missing)
+      expect(n.toHexNonce()).toBe(testsHexNonce)
+    })
+
     it('should be able to increment and reconstitute a new hex nonce', () => {
       // construct new nonce by incrementing the sequence number
       const nextNonce =