Optimize category parse for usual use case (#6959)

diff --git a/src/scales/scale.category.js b/src/scales/scale.category.js
index 5cd4cd96c1d489444a4d13bc8dea45accba0f4f2..40f0416fb632bb00ad63dad18dd4c88b84d2894f 100644 (file)
--- a/src/scales/scale.category.js
+++ b/src/scales/scale.category.js
@@ -8,6 +8,9 @@ const defaultConfig = {
 class CategoryScale extends Scale {
        _parse(raw, index) {
                const labels = this._getLabels();
+               if (labels[index] === raw) {
+                       return index;
+               }
                const first = labels.indexOf(raw);
                const last = labels.lastIndexOf(raw);
                return first === -1 || first !== last ? index : first;