Replace binds with lambdas

components/app.js

@@ -19,8 +19,18 @@ export default class App extends Component {
     this.state = {
       currentPage: 'Home'
     }
+    this.backHandler = BackHandler.addEventListener('hardwareBackPress', this.handleBackButtonPress)
+  }
 
-    const handleBackButtonPress = function() {
+  componentWillUnmount() {
+    this.backHandler.remove()
+  }
+
+  navigate = (pageName, props) => {
+    this.setState({currentPage: pageName, currentProps: props})
+  }
+
+  handleBackButtonPress = () => {
     if (this.state.currentPage === 'Home') return false
     if (isSymptomView(this.state.currentPage)) {
       this.navigate('CycleDay', { cycleDay: this.state.currentProps.cycleDay })
@@ -28,17 +38,6 @@ export default class App extends Component {
       this.navigate('Home')
     }
     return true
-    }.bind(this)
-
-    this.backHandler = BackHandler.addEventListener('hardwareBackPress', handleBackButtonPress)
-  }
-
-  componentWillUnmount() {
-    this.backHandler.remove()
-  }
-
-  navigate(pageName, props) {
-    this.setState({currentPage: pageName, currentProps: props})
   }
 
   render() {
@@ -51,12 +50,12 @@ export default class App extends Component {
         {this.state.currentPage != 'CycleDay' && <Header title={titles[this.state.currentPage]} />}
 
         {React.createElement(page, {
-          navigate: this.navigate.bind(this),
+          navigate: this.navigate,
           ...this.state.currentProps
         })}
 
         {!isSymptomView(this.state.currentPage) &&
-          <Menu navigate={this.navigate.bind(this)} />
+          <Menu navigate={this.navigate} />
         }
       </View>
     )

components/calendar.js

@@ -25,7 +25,7 @@ export default class CalendarView extends Component {
     bleedingDaysSortedByDate.removeListener(this.setStateWithCalFormattedDays)
   }
 
-  passDateToDayView(result) {
+  passDateToDayView = (result) => {
     const cycleDay = getOrCreateCycleDay(result.dateString)
     const navigate = this.props.navigate
     navigate('CycleDay', { cycleDay })
@@ -34,7 +34,7 @@ export default class CalendarView extends Component {
   render() {
     return (
       <CalendarList
-        onDayPress={this.passDateToDayView.bind(this)}
+        onDayPress={this.passDateToDayView}
         markedDates={this.state.bleedingDaysInCalFormat}
         markingType={'period'}
       />

components/cycle-day/cycle-day-overview.js

@@ -31,7 +31,7 @@ export default class CycleDayOverView extends Component {
     }
   }
 
-  goToCycleDay(target) {
+  goToCycleDay = (target) => {
     const localDate = LocalDate.parse(this.state.cycleDay.date)
     const targetDate = target === 'before' ?
       localDate.minusDays(1).toString() :
@@ -55,7 +55,7 @@ export default class CycleDayOverView extends Component {
           isCycleDayOverView={true}
           cycleDayNumber={cycleDayNumber}
           date={cycleDay.date}
-          goToCycleDay={this.goToCycleDay.bind(this)}
+          goToCycleDay={this.goToCycleDay}
         />
         <ScrollView>
           <View style={styles.symptomBoxesView}>
@@ -134,7 +134,10 @@ function getLabel(symptomName, symptom) {
     cervix: cervix => {
       let cervixLabel = []
       if (cervix.opening > -1 && cervix.firmness > -1) {
-        cervixLabel.push(openingLabels[cervix.opening], firmnessLabels[cervix.firmness])
+        cervixLabel.push(
+          openingLabels[cervix.opening],
+          firmnessLabels[cervix.firmness]
+        )
         if (cervix.position > -1) {
           cervixLabel.push(positionLabels[cervix.position])
         }

components/menu.js

@@ -8,7 +8,7 @@ import styles, { iconStyles } from '../styles'
 import Icon from 'react-native-vector-icons/MaterialCommunityIcons'
 
 export default class Menu extends Component {
-  makeMenuItem({ title, icon, onPress}, i) {
+  makeMenuItem = ({ title, icon, onPress}, i) => {
     return (
       <TouchableOpacity
         onPress={onPress}
@@ -36,7 +36,7 @@ export default class Menu extends Component {
           { title: 'Chart', icon: 'chart-line', onPress: () => this.goTo('Chart') },
           { title: 'Stats', icon: 'chart-pie', onPress: () => this.goTo('Stats') },
           { title: 'Settings', icon: 'settings', onPress: () => this.goTo('Settings') },
-        ].map(this.makeMenuItem.bind(this))}
+        ].map(this.makeMenuItem)}
       </View >
     )
   }