declare dynamic array based on dynamic variables in jquery

Question

This an array

 ARRAY = ["A","B","C","D","E"];
 var mlength = ARRAY.length;

Depending on mlength the length of DATES must be declared. Here the length is 5. Hence the array DATES must be var DATES = [[], [], [], [], []]; similarly if array ARRAY length is 3 then var DATES = [[], [], []]

This is static declaration. How do I declare it based upon the array ARRAY length?

How are you declaring these variables? I feel you're trying to solve this the wrong way... — tymeJV
– tymeJV, Commented Mar 23, 2015 at 16:03
I have edited my code. I just want to declare an empty array. Later I will push the values into it. That is a different coding. Only the size of array depends on the number of variables — rji rji
– rji rji, Commented Mar 23, 2015 at 16:09
@rjirji but the size doesn't matter at all, if you are only pushing values onto it. — user3310334
– user3310334, Commented Mar 23, 2015 at 16:14

score 3 · Accepted Answer · 2015-03-23 16:28:42Z

3

Well, this is easy:

var DATES=[];for (var i=0;i<mlength;DATES.push([]),i++);

Just push an empty array to DATES mlength number of times.

edited Mar 23, 2015 at 16:28

answered Mar 23, 2015 at 16:14

user3310334

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4 Comments

rji rji Over a year ago

Forget everything. Please see the question again. I have changed it completely

Heretic Monkey Over a year ago

"Please see the question again. I have changed it completely" This is considered bad form on SO, by the way. If you are tempted to change your question that much, create a new question, and delete this one if necessary.

rji rji Over a year ago

@theonlygusti - I got it thanq :)

rji rji Over a year ago

@theonlygusti - Can you do me one more favour? How do I declare MARKETS[i].push(parseFloat(findDataForMonth(mname+i, month)) || null); in the same manner where i=mlength here MARKETS[i] and mname+i are to be replaced by i in for loop

CrimsonChris · Accepted Answer · 2015-03-23 18:08:22Z

0

Alternative solution using Array.prototype.fill()

ARRAY = ["A","B","C","D","E"];
var mlength = ARRAY.length,
    DATES = [];

    DATES.length = mlength;
    DATES.fill([]);
    //DATES is now -> [ [], [], [], [], [], ]

edited Mar 23, 2015 at 18:08

answered Mar 23, 2015 at 16:26

CrimsonChris

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4 Comments

Heretic Monkey Over a year ago

It should be noted this depends on the array having a fill method, which is an ES6 feature not implemented in all browsers (specifically, not in IE). See this compatibility table for more information.

radiaph Over a year ago

Wouldn't this create the sub-array only once, and assign its reference to every slot of DATES?

rji rji Over a year ago

@MikeMcCaughan - its not working. I will show you the complete code. see this link its not working. I will show you my complete code. see this link jsfiddle.net/xbk57jdo/5 in line 111

Heretic Monkey Over a year ago

@rjirji, I'm not sure why you're pinging me about it. I wrote that comment to tell you (and everyone else) that the code most likely would not work, so it's not surprising to me that it does, in fact, not work.

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