Apologize upfront, I am very new to JS. Having trouble finding out where I should put the arrow function here for this question. I've tried putting it in the parameters when I call the function but ...

I am writing a function that needs to determine how many arguments have been passed to itself. I am able to get this information after a function has been declared, but whenever I call it from within ...

I've read in several places that the key difference is that this is lexically bound in arrow functions. That's all well and good, but I don't actually know what that means. I know it means it's unique ...

(() => console.log(arguments))(1,2,3); // Chrome, FF, Node give "1,2,3" // Babel gives "arguments is not defined" from parent scope According to Babel (and from what I can ...

I'm wondering why the following arrow function, named 'countArg2' doesn't work. Is there anybody can explain what's wrong please? This works function countArg1() { return arguments.length; } ...

How do you convert the following arrow function expression to a regular one? rootRef.on('child_removed', snapshot => { console.log('Child(s) removed'); B4A.CallSub('onchild_removed',true,&...

How do you write a PHP arrow function with multiple line expressions? JavaScript one-liner example: const dob = (age) => 2021 - age; PHP one-liner equivalent: $dob = fn($age) => 2021 - $age; ...

I'm trying to use JavaScript's map function to extract names from an array of objects. I expected it to return an array of names like ["Alice", "Bob", "Charlie"], but it ...

While learning JS and React I've come across confusing differences in tutorials. I'll split the questions below with examples. I understand bind for regular functions and this context, it's just arrow ...

Ok, I have the following scenario: type IHashFn = (arg: string) => number; const hash: IHashFn = (arg) => { return 42; } So far, so good. Now I want the function to be generic. const hash: &...

Calling a callback function to get values and render it in onDownload: (buildHead, buildBody, columns, data) => { if (this.state.isexceldownload) { this.callbackMethod((d) =&...

I have a function that I am trying to convert to the new arrow syntax in ES6. It is a named function: function sayHello(name) { console.log(name + ' says hello'); } Is there a way to give it a ...

I am merging a folder 250 of large .txt files each approximately 1GB and over 6 million rows. I'm merging this folder with another .txt file outside of this folder that is also 1GB based on a common ...

I have a large dataset of over 43 million rows and 3.84 GB and another dataset of over 6000 rows and 459 KB. I am trying to do an inner_join() based on two columns: One exact column based on a common ...

I have a JavaScript object that's defined like this: const test = { myFirstFunction: () => { console.log('MyFirstFunction called'); this.mySecondFunction('data'); }, ...