Menu
I have two function in my react-app components
componentDidMount() {
if(Object.keys(this.props.praticiens).length>0)
Object.keys(this.props.praticiens).map((praticien) => {
if(this.props.praticiens[praticien].identifiant_user === getUrlParams(window.location.hash).identifiant_user)
this.setState({
praticien:this.props.praticiens[praticien].id_user
})
})
}
handleChangePraticien = (praticien) => {
this.setState({ praticien }, () => {
Object.keys(this.props.praticiens).map((praticien) => {
if(this.state.praticien === this.props.praticiens[praticien].id_user)
this.props.selectPraticienFunction(this.props.praticiens[praticien].identifiant_user);
})
})
}
When I run it, I get:
Line 26:64: Expected to return a value in arrow function array-callback-return
Line 36:64: Expected to return a value in arrow function array-callback-return
Such as the Line 26 is beginning Object.keys(this.props.praticiens).map((praticien) => { on componentDidMount and Line 36 is the same line on the handleChangePraticien function
How can I fix it ?
641
The most common and standard way of returning an object from an arrow function would be to use the longform syntax: const createMilkshake = (name) => { return { name, price: 499 }; }; const raspberry = createMilkshake('Raspberry'); // 'Raspberry' console.
Arrow functions can have either a concise body or the usual block body. In a concise body, only an expression is specified, which becomes the implicit return value. In a block body, you must use an explicit return statement.
Arrow Functions Return Value by Default: Note: This works only if the function has only one statement.
When returning an object from an arrow function, it seems that it is necessary to use an extra set of {} and a return keyword because of an ambiguity in the grammar. That means I can't write p => {foo: "bar"} , but have to write p => { return {foo: "bar"}; } .
Changing {} to () worked for me
from map(() => {}) to map(() => ())
199
Line 26:64: Expected to return a value in arrow function array-callback-return
Since you do not care about returning a value from the arrow function and you are not using the array returned by the map(), you should be using forEach() function instead.
componentDidMount() {
if(Object.keys(this.props.praticiens).length>0)
Object.keys(this.props.praticiens).forEach((praticien) => {
if(this.props.praticiens[praticien].identifiant_user === getUrlParams(window.location.hash).identifiant_user)
this.setState({
praticien:this.props.praticiens[praticien].id_user
})
})
}
handleChangePraticien = (praticien) => {
this.setState({ praticien }, () => {
Object.keys(this.props.praticiens).forEach((praticien) => {
if(this.state.praticien === this.props.praticiens[praticien].id_user)
this.props.selectPraticienFunction(this.props.praticiens[praticien].identifiant_user);
})
})
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
