102 questions
1
vote
0
answers
40
views
JavaScript Immediately Invoked Function - Distinguishing Between JavaScript Function Expressions and Declarations [duplicate]
In my journey of learning JavaScript, I encountered my first practical use case for an Immediately Invoked Function Expression (IIFE).
However, I'm struggling to understand the distinction between a ...
- 111
0
votes
2
answers
74
views
Function Expression vs Function Declaration in Javascript Decorators
I have a problem understanding how different ways to create a function are affecting decorators. I am trying to create a decorator that will allow me to count how may times function was called:
...
0
votes
1
answer
27
views
On the fly function expression doesn't throw error when triggering with first class [duplicate]
I am learning Javascript and I came across these concepts of function expressions & first class functions.
While I do understand their definition, I am unable to understand why my code behaves the ...
-1
votes
2
answers
161
views
How to write Java Script arrow functions in regular function syntax?
I need help to rewrite some arrow functions to regular functions but right now my brain is totally stucked, I have some example code here from a rock paper scissors game I got from kyle, how would it ...
- 9
-1
votes
1
answer
597
views
How can I validate email,firstname and lastname?
I try to validate firstname,lastname and email taken by user and return true if its valid or return false if it is not valid then ask the user to enter again as long as it is not valid.By writing a ...
- 13
0
votes
1
answer
546
views
how to conditionally include or exclude statements from function expression
i have 2 different javascript environments and want to create a library usable on both. to do that i want to use higher order functions to generate my functions, like so
try {
Maptool.chat....
- 1
0
votes
2
answers
218
views
JavaScript hoisting for function expression and function declaration [duplicate]
I am learning hoisting in JavaScript and practicing some examples.
In an example I am confused of it's output.
Here is the example code:
var f = function(){
console.log("Expression");
}
...
3
votes
2
answers
653
views
When we should use class expression in Javascript?
I have recently got to know that we do have class expressions too like function expressions in JS. I know some points about it(MDN) like:
Class expressions may omit the class name ("binding ...
- 8,803
0
votes
2
answers
70
views
How to convert an arrow function expression into an equivalent ordinary (old-style) function expression?
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,&...
- 36
-2
votes
1
answer
471
views
How to create a function expression that returns an array?
(The challenge reads like this)
Create a function expression named getNumberAr with no parameters
The getNumberAr function should return an array of 5 numbers
Call getNumberAr and store its result ...
- 1
0
votes
1
answer
625
views
Dart/Flutter arrow function expression confusion
I'm confused with arrow syntax in this Navigator implementation:
Navigator.push(
MaterialPageRoute(
context,
builder: (context) => aWidgetConstructor()
)
)
From what I guess, the ...
1
vote
1
answer
63
views
Can You Implement Javascript Class Via Function Expression?
I was tackling this question in leet code:
Implement the MapSum class:
MapSum() Initializes the MapSum object. void insert(String key, int
val) Inserts the key-val pair into the map. If the key ...
- 1,954
0
votes
1
answer
395
views
Is this an arrow function declaration? Is there such a thing?
I am looking into function expressions vs function declarations using arrow functions.
I am thinking this is an arrow function expression:
const johan = greeting = () => {
console.log("Hi ...
0
votes
3
answers
49
views
Difficulty Iterating Through Function Call - First Class Functions
The code I have provided executes properly, however as you will see it offers refreshments to each guest repeatedly before moving on to the next guest.
I'm scratching my head as to how I can alter my ...
- 19
1
vote
2
answers
203
views
What is the difference between 'let' and 'this' in JavaScript?
I'm learning JavaScript, coming from Ruby, have done some stuff in C as well. One example in my reading is:
function letCounter() {
let counter = 0;
return () => ++counter;
}
and is compared ...
- 830