feat: add capitalizeFirstLetter (#143)

Author: oyin-k

src/convert-first-letter-to-capital.js

@@ -0,0 +1,12 @@
+export default capitalizeFirstLetter
+
+/**
+ * Original source: https://stackoverflow.com/questions/1026069/
+ * This function would convert the first letter of any string passed to it into uppercase
+ * it is a copy
+ * @param {string}string - The string to capitalize the first letter of a string
+ * @return {string} - The capitalized string
+**/
+function capitalizeFirstLetter(string) {
+  return string.charAt(0).toUpperCase() + string.slice(1)
+}

src/index.js

@@ -1,4 +1,5 @@
 import isEven from './is-even'
+import capitalizeFirstLetter from './convert-first-letter-to-capital'
 import revstring from './revstring'
 import initArray from './init-array'
 import reduce from './reduce-to-tally'
@@ -52,6 +53,7 @@ import median from './array-median'
 
 export {
   isOdd,
+  capitalizeFirstLetter,
   isEven,
   revstring,
   initArray,

test/convert-first-letter-to-capital.test.js

@@ -0,0 +1,9 @@
+import test from 'ava'
+import {capitalizeFirstLetter} from '../src'
+
+test('capitalize first letter', t => {
+  const original = 'oyinkan'
+  const expected = 'Oyinkan'
+  const actual = capitalizeFirstLetter(original)
+  t.deepEqual(actual, expected)
+})