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How to pass event and other arguments inside an arrow function in ReactJs


By : M.M. Visser
Date : September 15 2020, 01:00 PM
may help you . I was following a tutorial there after and found it, so thought it was worth sharing..
And event can be sent in the first parenthesis of the arrow function like this:
code :
changed={(event)=>this.nameChange(event, index)}


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Pass event args and event object to event handler without arrow function in ReactJS


By : johnluke
Date : March 29 2020, 07:55 AM
Does that help I've never it actively discouraged. The part of the documentation you are referring to is when you aren't passing extra arguments.
When you are passing arguments, the way you have presented is exactly the way to do it.

Should we avoid arrow function inside JSX: ReactJS


By : abby
Date : March 29 2020, 07:55 AM
this one helps. Is providing a setState-function as onClick-property directly a bad thing, cause the function will be defined with every render again? Should it be declared as function instead, e. g. this.open? ,
Cause the function will be defined with every render again?
code :
Block Body:  () => {....}

Concise Body: () => expression
handleClick(){
   this.setState(prevState => ({ isOpen: !prevState.isOpen }))
}

onClick={this.handleClick}

Function in Reactjs .NET is never reached - how to call a simple arrow function inside render?


By : Oschangkai
Date : March 29 2020, 07:55 AM
With these it helps You test function is just that, a function. JSX doesn't know what to do with that. would presumably instantiate a React component. And {test} would interpolate some javascript value. Your call does neither. It sticks a function on the page which doesn't render and doesn't execute.
If you want to call your test function, you call it like you would any other javascript function: {test()}.

How should I pass three arguments to an express/node arrow function?


By : Kalmer Piiskop
Date : March 29 2020, 07:55 AM
help you fix your problem The problem is not (necessarily) with how you define the function but with how you are using it.
parseConnections('./tmp/connections.csv') calls the function right then and there. You are only passing a single argument to it, so req and res will be undefined.
code :
function foo(a, b, c) {
  console.log('a:', a);
  console.log('b:', b);
  console.log('c:', c);
}

foo('first argument');
function foo(x) {
  console.log('inside foo', 'x is ', x);
}

// bar expects to be passed a function that it can call
function bar(callback) {
  console.log('bar received:', callback);
  try {
    callback(42);
  } catch(e) {
    console.error(e);
  }
}


// this will work as expected
console.log('Passing a function');
bar(foo); 

// this will error because `bar` doesn't receive a function.
// this is what you are doing
console.log('Calling a function and passing its return value');
bar(foo(21));
function parseConnections(connectionsCSVPath) {
  return function(req, res) {
     //do a bunch of stuff 
  };
} 
router.post(
  '/upload/engagements/batch',
  checkIfAuthenticated,
  (req, res) => parseConnections('./tmp/connections.csv', req, res),
  // alternatively you can use `.bind`:
  // parseConnections.bind(null, './tmp/connections.csv'),
  parseMessages('./tmp/messages.csv'), // <- this is likely wrong as well,
                                       // but I leave this to you to figure out
  (req, res) => { 
    //do a bunch of stuff 
  }
);

How to pass params with arrow function in ReactJS hooks


By : user3693368
Date : March 29 2020, 07:55 AM
Does that help I am new to ReactJS, I am confused how to pass params with arrow functions, I tried to use .bind() to bind the value so i can use it in the function but it didn't work, and passing it like a normal function didn't work as well.
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