Having trouble retrieving array information in Javascript

Question

Having trouble retrieving array information in Javascript

I've recently started learning programming and JavaScript, but I'm struggling to access data within an array. Below is a snippet of my code:

global.arr = [];
var id = 12;

for (var i=0; i<5; i++) {
   arr.push(id);
   id++;
}
console.log(arr);
console.log(arr[0]);

My question is, how can I properly access the data in this array? What am I doing wrong here?

Despite making changes, my current code still isn't working as expected:

var arr = [];
var id = 12;

for (var i=0; i<5; i++) {
   arr.push(id);
   id++;
}
console.log(arr);
console.log(arr[0]);

javascript arrays

Answer 1

Answer №1

Edit: To further clarify:

global is not treated as a JavaScript object in the same way. There are indeed global objects, but they are typically accessed using window rather than global. Your code would only function correctly if you had previously assigned window to global.

If there isn't a compelling reason to utilize global (or even

window</code), it's best to simply declare the array (and any other variables) with either <code>var

or let.

let arr = [];
let id = 12;

for (let i=0; i<5; i++) {
   arr.push(id);
   id++;
}
console.log(arr);
console.log(arr[0]);

Answer 2

Edit: To further clarify:

global is not treated as a JavaScript object in the same way. There are indeed global objects, but they are typically accessed using window rather than global. Your code would only function correctly if you had previously assigned window to global.

If there isn't a compelling reason to utilize global (or even

window</code), it's best to simply declare the array (and any other variables) with either <code>var

or let.

let arr = [];
let id = 12;

for (let i=0; i<5; i++) {
   arr.push(id);
   id++;
}
console.log(arr);
console.log(arr[0]);

Answer 3

Answer №2

My theory is that the culprit may be the global variable. It seems to function properly when accessed through a web browser and using window

window.arr = [];
var id = 12;

for (var i=0; i<5; i++) {
   arr.push(id);
   id++;
}
console.log(arr);
console.log(arr[0]);

Nevertheless, it would be wiser not to assign values directly to the window object. Instead, consider using either var arr = [] or let arr = []

Answer 4

My theory is that the culprit may be the global variable. It seems to function properly when accessed through a web browser and using window

window.arr = [];
var id = 12;

for (var i=0; i<5; i++) {
   arr.push(id);
   id++;
}
console.log(arr);
console.log(arr[0]);

Nevertheless, it would be wiser not to assign values directly to the window object. Instead, consider using either var arr = [] or let arr = []

Answer 5

Answer №3

When working with a global array, there is no need to explicitly set it:

global.arr = [];

Instead, you can simply declare a let variable:

let arr = [];
var id = 12;

For more information on using the let keyword, refer to: Let

Once you have declared your variables, you can proceed with your code:

let arr = [];
var id = 12;

for (var i=0; i<5; i++) {
 arr.push(id);
 id++;
}
console.log(arr);
console.log(arr[0]);

Answer 6

When working with a global array, there is no need to explicitly set it:

global.arr = [];

Instead, you can simply declare a let variable:

let arr = [];
var id = 12;

For more information on using the let keyword, refer to: Let

Once you have declared your variables, you can proceed with your code:

let arr = [];
var id = 12;

for (var i=0; i<5; i++) {
 arr.push(id);
 id++;
}
console.log(arr);
console.log(arr[0]);

Answer 7

Answer №4

When a variable is declared outside of a function, it becomes a global variable. In this example, the variable arr is being declared.

var myArray = [];
var number = 12;
for (var index=0; index<5; index++) {
   myArray.push(number);
   number++;
}
console.log(myArray);
console.log(myArray[0]);

Answer 8

When a variable is declared outside of a function, it becomes a global variable. In this example, the variable arr is being declared.

var myArray = [];
var number = 12;
for (var index=0; index<5; index++) {
   myArray.push(number);
   number++;
}
console.log(myArray);
console.log(myArray[0]);

Having trouble retrieving array information in Javascript

Answer №1

Answer №2

Answer №3

Answer №4

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