49 replies

javascript questions

Hey, I have a few questions about Javascript:

1) what is the main difference between arrow functions and normal functions? Is there any benefits to using one over the other?

2) what do constructors such as

let x = new Function()

let x = new Function()

let x = new Map()

let x = new Map()

mean? Using the second example, is this just a different way of writing

x.map(.. => {…})

x.map(.. => {…})

?

3) what is the difference between writing

Array.prototype.toString

Array.prototype.toString

for example over

x.toString()

x.toString()

?

4) are there more to callback functions rather than them representing individual items? For example,

item

item

would represent the individual items in the list below

x = [1, 2, 3]

x.filter(item => {
  return item < 3
})

x = [1, 2, 3]

x.filter(item => {
  return item < 3
})

I’d appreciate any help. Thank you in advance.

KP-C

Kevin Powell - Community•2y ago•

49 replies

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javascript questions

let x = new Function()

let x = new Function()

let x = new Map()

let x = new Map()

mean? Using the second example, is this just a different way of writing

x.map(.. => {…})

x.map(.. => {…})

?

3) what is the difference between writing

Array.prototype.toString

Array.prototype.toString

for example over

x.toString()

x.toString()

?

4) are there more to callback functions rather than them representing individual items? For example,

item

item

would represent the individual items in the list below

x = [1, 2, 3]

x.filter(item => {
  return item < 3
})

x = [1, 2, 3]

x.filter(item => {
  return item < 3
})

I’d appreciate any help. Thank you in advance.

javascript questions

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