Convert line controller to use const/let (#6820)

diff --git a/src/controllers/controller.line.js b/src/controllers/controller.line.js
index 8e89da32f818f1fc2816346db8956cb117185146..90ac98672f076790569b87367ba8656cbecbc6b6 100644 (file)
--- a/src/controllers/controller.line.js
+++ b/src/controllers/controller.line.js
@@ -1,13 +1,13 @@
 'use strict';
 
-var DatasetController = require('../core/core.datasetController');
-var defaults = require('../core/core.defaults');
-var elements = require('../elements/index');
-var helpers = require('../helpers/index');
+const DatasetController = require('../core/core.datasetController');
+const defaults = require('../core/core.defaults');
+const elements = require('../elements/index');
+const helpers = require('../helpers/index');
 
-var valueOrDefault = helpers.valueOrDefault;
-var resolve = helpers.options.resolve;
-var isPointInArea = helpers.canvas._isPointInArea;
+const valueOrDefault = helpers.valueOrDefault;
+const resolve = helpers.options.resolve;
+const isPointInArea = helpers.canvas._isPointInArea;
 
 defaults._set('line', {
        showLines: true,
@@ -101,7 +101,7 @@ module.exports = DatasetController.extend({
        updateElements: function(points, start, count, reset) {
                const me = this;
                const {xScale, yScale, _stacked} = me._cachedMeta;
-               var i;
+               let i;
 
                for (i = start; i < start + count; ++i) {
                        const point = points[i];
@@ -135,11 +135,11 @@ module.exports = DatasetController.extend({
         * @private
         */
        _resolveDatasetElementOptions: function() {
-               var me = this;
-               var config = me._config;
-               var options = me.chart.options;
-               var lineOptions = options.elements.line;
-               var values = DatasetController.prototype._resolveDatasetElementOptions.apply(me, arguments);
+               const me = this;
+               const config = me._config;
+               const options = me.chart.options;
+               const lineOptions = options.elements.line;
+               const values = DatasetController.prototype._resolveDatasetElementOptions.apply(me, arguments);
 
                // The default behavior of lines is to break at null values, according
                // to https://github.com/chartjs/Chart.js/issues/2435#issuecomment-216718158
@@ -155,26 +155,26 @@ module.exports = DatasetController.extend({
         * @private
         */
        _getMaxOverflow: function() {
-               var me = this;
-               var meta = me._cachedMeta;
-               var data = meta.data || [];
+               const me = this;
+               const meta = me._cachedMeta;
+               const data = meta.data || [];
                if (!data.length) {
                        return false;
                }
-               var border = me._showLine ? meta.dataset._model.borderWidth : 0;
-               var firstPoint = data[0].size();
-               var lastPoint = data[data.length - 1].size();
+               const border = me._showLine ? meta.dataset._model.borderWidth : 0;
+               const firstPoint = data[0].size();
+               const lastPoint = data[data.length - 1].size();
                return Math.max(border, firstPoint, lastPoint) / 2;
        },
 
        updateBezierControlPoints: function() {
-               var me = this;
-               var chart = me.chart;
-               var meta = me._cachedMeta;
-               var lineModel = meta.dataset._model;
-               var area = chart.chartArea;
-               var points = meta.data || [];
-               var i, ilen, model, controlPoints;
+               const me = this;
+               const chart = me.chart;
+               const meta = me._cachedMeta;
+               const lineModel = meta.dataset._model;
+               const area = chart.chartArea;
+               let points = meta.data || [];
+               let i, ilen;
 
                // Only consider points that are drawn in case the spanGaps option is used
                if (lineModel.spanGaps) {
@@ -191,8 +191,8 @@ module.exports = DatasetController.extend({
                        helpers.splineCurveMonotone(points);
                } else {
                        for (i = 0, ilen = points.length; i < ilen; ++i) {
-                               model = points[i]._model;
-                               controlPoints = helpers.splineCurve(
+                               const model = points[i]._model;
+                               const controlPoints = helpers.splineCurve(
                                        points[Math.max(0, i - 1)]._model,
                                        model,
                                        points[Math.min(i + 1, ilen - 1)]._model,
@@ -207,7 +207,7 @@ module.exports = DatasetController.extend({
 
                if (chart.options.elements.line.capBezierPoints) {
                        for (i = 0, ilen = points.length; i < ilen; ++i) {
-                               model = points[i]._model;
+                               const model = points[i]._model;
                                if (isPointInArea(model, area)) {
                                        if (i > 0 && isPointInArea(points[i - 1]._model, area)) {
                                                model.controlPointPreviousX = capControlPoint(model.controlPointPreviousX, area.left, area.right);
@@ -223,14 +223,14 @@ module.exports = DatasetController.extend({
        },
 
        draw: function() {
-               var me = this;
-               var ctx = me._ctx;
-               var chart = me.chart;
-               var meta = me._cachedMeta;
-               var points = meta.data || [];
-               var area = chart.chartArea;
-               var i = 0;
-               var ilen = points.length;
+               const me = this;
+               const ctx = me._ctx;
+               const chart = me.chart;
+               const meta = me._cachedMeta;
+               const points = meta.data || [];
+               const area = chart.chartArea;
+               const ilen = points.length;
+               let i = 0;
 
                if (me._showLine) {
                        meta.dataset.draw(ctx);
@@ -246,9 +246,9 @@ module.exports = DatasetController.extend({
         * @protected
         */
        setHoverStyle: function(point) {
-               var model = point._model;
-               var options = point._options;
-               var getHoverColor = helpers.getHoverColor;
+               const model = point._model;
+               const options = point._options;
+               const getHoverColor = helpers.getHoverColor;
 
                point.$previousStyle = {
                        backgroundColor: model.backgroundColor,