Currently learning Node.JS and making a basic command prompt note application. While working on the listNotes function (meant to display all titles of the notes) I initially started with this:
const notes = loadNotes()
for (let note in notes) {
console.log(note.title)
}
This left me with an undefined.
However,
const notes = loadNotes()
notes.forEach((note) => {
console.log(note.title)
})
left me with the actual note title.
What is the difference between forEach and and a for loop in this case?
For clarification, all my loadNotes() method is doing is reading a JSON file and parsing it into an object. If file doesn't exist, it creates an empty array
Note can be defined as:
Note[{
title: "string",
body: "string"
}]
Thanks in advance!
You should use "of" instead of "in"
ex:
const notes = loadNotes()
for (let note of notes) {
console.log(note.title)
}
Like Phil pointed out, for..in will iterate indexes.
Ex, if notes is an array:
const notes = loadNotes()
for (let index in notes) {
console.log(index)
}
// outputs are: 0,1,2, etc...
// You are doing something like: 1.title, 2.title
// 'title' is not a field of these numeric values,
// so you are getting 'undefined' values