add convertToFirstLetter method

跟随 `.STYLE_FIRST_LETTER` 功能.
iugo · Jul 26, 2017 · 00a27eb · 00a27eb
1 parent 7574e25
commit 00a27eb
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/src/core.js b/src/core.js
@@ -132,6 +132,15 @@ module.exports = {
   parse,
   patchDict,
   genToken, // inner usage
+  convertToFirstLetter(str) {
+    return parse(str).reduce((acc, val) => {
+      const code = val.target.charCodeAt(0);
+      if (code < 48 || code > 122 || (code > 90 && code < 97) || (code > 57 && code < 65)) {
+        return acc;
+      }
+      return acc + val.target[0];
+    }, '')
+  },
   convertToPinyin (str, separator, lowerCase) {
     return parse(str).map(v => {
       if (lowerCase && v.type === PINYIN) {