Use Math.min/max instead of if statement

Author: benmccann

src/scales/scale.linear.js

@@ -27,8 +27,8 @@ module.exports = LinearScaleBase.extend({
 		}
 
 		// First Calculate the range
-		me.min = null;
-		me.max = null;
+		me.min = Number.POSITIVE_INFINITY;
+		me.max = Number.NEGATIVE_INFINITY;
 
 		var hasStacks = opts.stacked;
 		if (hasStacks === undefined) {
@@ -93,10 +93,8 @@ module.exports = LinearScaleBase.extend({
 
 			helpers.each(valuesPerStack, function(valuesForType) {
 				var values = valuesForType.positiveValues.concat(valuesForType.negativeValues);
-				var minVal = helpers.min(values);
-				var maxVal = helpers.max(values);
-				me.min = me.min === null ? minVal : Math.min(me.min, minVal);
-				me.max = me.max === null ? maxVal : Math.max(me.max, maxVal);
+				me.min = Math.min(me.min, helpers.min(values));
+				me.max = Math.max(me.max, helpers.max(values));
 			});
 
 		} else {
@@ -111,20 +109,15 @@ module.exports = LinearScaleBase.extend({
 							continue;
 						}
 
-						if (me.min === null || value.min < me.min) {
-							me.min = value.min;
-						}
-
-						if (me.max === null || me.max < value.max) {
-							me.max = value.max;
-						}
+						me.min = Math.min(value.min, me.min);
+						me.max = Math.max(value.max, me.max);
 					}
 				}
 			}
 		}
 
-		me.min = isFinite(me.min) && !isNaN(me.min) ? me.min : DEFAULT_MIN;
-		me.max = isFinite(me.max) && !isNaN(me.max) ? me.max : DEFAULT_MAX;
+		me.min = helpers.isFinite(me.min) && !isNaN(me.min) ? me.min : DEFAULT_MIN;
+		me.max = helpers.isFinite(me.max) && !isNaN(me.max) ? me.max : DEFAULT_MAX;
 
 		// Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
 		this.handleTickRangeOptions();

src/scales/scale.logarithmic.js

@@ -80,9 +80,9 @@ module.exports = Scale.extend({
 		var datasetIndex, meta, value, data, i, ilen;
 
 		// Calculate Range
-		me.min = null;
-		me.max = null;
-		me.minNotZero = null;
+		me.min = Number.POSITIVE_INFINITY;
+		me.max = Number.NEGATIVE_INFINITY;
+		me.minNotZero = Number.POSITIVE_INFINITY;
 
 		var hasStacks = opts.stacked;
 		if (hasStacks === undefined) {
@@ -131,8 +131,8 @@ module.exports = Scale.extend({
 				if (valuesForType.length > 0) {
 					var minVal = helpers.min(valuesForType);
 					var maxVal = helpers.max(valuesForType);
-					me.min = me.min === null ? minVal : Math.min(me.min, minVal);
-					me.max = me.max === null ? maxVal : Math.max(me.max, maxVal);
+					me.min = Math.min(me.min, minVal);
+					me.max = Math.max(me.max, maxVal);
 				}
 			});
 
@@ -148,22 +148,21 @@ module.exports = Scale.extend({
 							continue;
 						}
 
-						if (me.min === null || value.min < me.min) {
-							me.min = value.min;
-						}
-
-						if (me.max === null || me.max < value.max) {
-							me.max = value.max;
-						}
+						me.min = Math.min(value.min, me.min);
+						me.max = Math.max(value.max, me.max);
 
-						if (value.min !== 0 && (me.minNotZero === null || value.min < me.minNotZero)) {
-							me.minNotZero = value.min;
+						if (value.min !== 0) {
+							me.minNotZero = Math.min(value.min, me.minNotZero);
 						}
 					}
 				}
 			}
 		}
 
+		me.min = helpers.isFinite(me.min) ? me.min : null;
+		me.max = helpers.isFinite(me.max) ? me.max : null;
+		me.minNotZero = helpers.isFinite(me.minNotZero) ? me.minNotZero : null;
+
 		// Common base implementation to handle ticks.min, ticks.max
 		this.handleTickRangeOptions();
 	},

test/specs/core.ticks.tests.js

@@ -45,8 +45,8 @@ describe('Test tick generators', function() {
 		var xAxis = chart.scales['x-axis-0'];
 		var yAxis = chart.scales['y-axis-0'];
 
-		expect(xAxis.ticks).toEqual(['-1', '-0.8', '-0.6', '-0.4', '-0.2', '0', '0.2', '0.4', '0.6', '0.8', '1']);
-		expect(yAxis.ticks).toEqual(['1', '0.8', '0.6', '0.4', '0.2', '0', '-0.2', '-0.4', '-0.6', '-0.8', '-1']);
+		expect(xAxis.ticks).toEqual(['0', '0.1', '0.2', '0.3', '0.4', '0.5', '0.6', '0.7', '0.8', '0.9', '1']);
+		expect(yAxis.ticks).toEqual(['1', '0.9', '0.8', '0.7', '0.6', '0.5', '0.4', '0.3', '0.2', '0.1', '0']);
 	});
 
 	it('Should generate logarithmic spaced ticks with correct precision', function() {

test/specs/scale.linear.tests.js

@@ -453,7 +453,7 @@ describe('Linear Scale', function() {
 		});
 
 		expect(chart.scales.yScale0).not.toEqual(undefined); // must construct
-		expect(chart.scales.yScale0.min).toBe(-1);
+		expect(chart.scales.yScale0.min).toBe(0);
 		expect(chart.scales.yScale0.max).toBe(1);
 	});
 
@@ -829,10 +829,11 @@ describe('Linear Scale', function() {
 		var chart = window.acquireChart({
 			type: 'line',
 			data: {
+				labels: [-1, 1],
 				datasets: [{
 					xAxisID: 'xScale0',
 					yAxisID: 'yScale0',
-					data: []
+					data: [-1, 1]
 				}],
 			},
 			options: {