utils: add a hash function

src/utils/hash.ts

@@ -0,0 +1,8 @@
+export const hash = (str: string) => {
+  let ret = 0
+  for (let i = 0; i < str.length; i++) {
+    ret = ((ret << 5) - ret) + str.charCodeAt(i)
+    ret = ret & ret
+  }
+  return ret
+}

src/utils/index.ts

@@ -1,3 +1,4 @@
+export * from './hash'
 export * from './clone'
 export * from './valid'
 export * from './option'

test/specs/utils/utils.spec.ts

@@ -1,4 +1,4 @@
-import { forEach, clone, getType, assert } from '../../index'
+import { forEach, clone, getType, assert, hash } from '../../index'
 import { describe, it } from 'tman'
 import { expect } from 'chai'
 
@@ -397,4 +397,14 @@ export default describe('Utils Testcase: ', () => {
 
   })
 
+  describe('Func: hash', () => {
+
+    it('should be able to convert string to hash', () => {
+      expect(hash('')).to.equal(0)
+      expect(hash(' ')).to.equal(32)
+      expect(hash('  ')).to.equal(1024)
+    })
+
+  })
+
 })