Create array based on variable value with javascript

Question 1

I have a variable with a dynamic value (from 1 to 15). Depending on the value of the variable, I want to create an array with the same length.

And, if for example the variable value is 1, I want to store A in the array, if the value is 6 I want to store A,B,C,D,E,F in the array and so on.

How do I achieve this? Thanks in advance.

Question 2

Is this homework? If so, please tag it as such.

Question 3

@Oded, Homework, in the middle of the summer?

Question 4

@Anders - It is not summer in the south of our little globe, and not everyone in the world has summer vacation right now. Global community and all, you know?

Question 5

Well, I am in Australia and it's winter here. No, it's not homework, thanks.

Question 6

wait, people outside the US have internet? woah!

Question 7

var sizeOfArray = 6;
"ABCDEFGHIJKLMNO".slice(0, sizeOfArray).split('');
// ["A", "B", "C", "D", "E", "F"]

Question 8

Thanks Anurag, so where do I create the array?

Question 9

The second statement returns an array. The split function is doing that for you.

Question 10

Well, he only mentioned an idea, not the full solution (nice idea btw). The full solution would be: var sizeOfArray=6; var newArray = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".slice(0, sizeOfArray).split('');

Question 11

so the name of the array will be sizeOfArray?

Question 12

No, my comment creates a variable "newArray". Original post has no variable with array. There are no line-breaks in comments so I had to put it in 1 line.

Question 13

var arrSize = 4;
var myArray = new Array(arrSize);

or you can declare the array without size and then push a new element in it:

var myArray = new Array();
myArray.push(ITEM);

where ITEM is replaced by a variable or string or number you want to add in the array (will be added at the end of the array)

Question 14

My 2 cents. (this function takes size> 26 into account)

<script type="text/javascript">
 function buildAlphabetArray(size) {
 var range = 26;
 var arr = new Array();
 for (var i = 0; i <= parseInt(size); i++) {
 //calculate current index (recalc to number between 0 and range)
 var j = (i < (range-1) ? i : (i - range * parseInt(i / range))); 
 //get the char value of ascii 65 + index (charAt(65)==A)
 arr[i] = String.fromCharCode(j + 65); //
 }
 //test
 //alert(arr.join(""));
 return arr;
 }
</script>

Question 15

var a = 5;
var arr = new Array(a);
for (var i = 0;i<a;i++) {
 arr[i] = String.fromCharCode(65+i);
 document.write("arr["+i+"] = '"+arr[i]+"'<br/>");
}

Anurag 142k37 gold badges223 silver badges262 bronze badges · Accepted Answer · 2010-07-30 07:59:06Z

4

var sizeOfArray = 6;
"ABCDEFGHIJKLMNO".slice(0, sizeOfArray).split('');
// ["A", "B", "C", "D", "E", "F"]

Share

Improve this answer

answered Jul 30, 2010 at 7:59

Anurag's user avatar

Anurag

142k37 gold badges223 silver badges262 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

peter

peter Over a year ago

Thanks Anurag, so where do I create the array?

2010年07月30日T08:02:36.923Z+00:00

Anurag

Anurag Over a year ago

The second statement returns an array. The split function is doing that for you.

2010年07月30日T08:03:08.827Z+00:00

bezmax

bezmax Over a year ago

Well, he only mentioned an idea, not the full solution (nice idea btw). The full solution would be: var sizeOfArray=6; var newArray = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".slice(0, sizeOfArray).split('');

2010年07月30日T08:04:47.627Z+00:00

peter

peter Over a year ago

so the name of the array will be sizeOfArray?

2010年07月30日T08:06:13.127Z+00:00

bezmax

bezmax Over a year ago

No, my comment creates a variable "newArray". Original post has no variable with array. There are no line-breaks in comments so I had to put it in 1 line.

2010年07月30日T08:08:11.177Z+00:00

CollectivesTM on Stack Overflow

Create array based on variable value with javascript

4 Answers 4

5 Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Post as a guest

Hot Network Questions

CollectivesTM on Stack Overflow

4 Answers 4

5 Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Post as a guest

Related