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Smarter Way to Initialize Array in Javascript [duplicate]

Most efficient way to create a zero filled JavaScript array?How do JavaScript closures work?What is the most efficient way to deep clone an object in JavaScript?How do I remove a property from a JavaScript object?Which equals operator (== vs ===) should be used in JavaScript comparisons?How do I include a JavaScript file in another JavaScript file?What does “use strict” do in JavaScript, and what is the reasoning behind it?How to check whether a string contains a substring in JavaScript?Loop through an array in JavaScriptHow do I remove a particular element from an array in JavaScript?For-each over an array in JavaScript?

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0

0

This question already has an answer here:

• 
  Most efficient way to create a zero filled JavaScript array?
  
  38 answers
  
  

I made this code to check out how "random" the random function is.

Array.prototype.random = function() 
 var index = Math.floor(this.length*Math.random());
 return this[index];

var arr = new Array('a', 'b', 'c', 'd', 'e');

var count = [0, 0, 0, 0, 0]; //I want to ask about this part

for (var i = 0; i < 10000; i++) 
 var val = arr.random();
 console.log(val);

 switch (val) 
 case 'a':
 count[0]++;
 break;
 case 'b':
 count[1]++;
 break;
 case 'c':
 count[2]++;
 break;
 case 'd':
 count[3]++;
 break;
 case 'e':
 count[4]++;
 break;
 


for (var i = 0; i < count.length; i++) console.log(count[i]); 

In the process, I couldn't think of better way to initialize the 'count' array. Using that way, it would get really repetitive. I would have to put thousand 0 if my 'arr' has 1000 elements. Can anybody suggest better way for me?

If I don't initialize each element of 'count' array as 0, I get NaN.

javascript

share|improve this question

asked Mar 25 at 14:47

LemileLemile

2033 bronze badges

marked as duplicate by VLAZ, Mark Meyer javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

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Mar 25 at 14:58

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  .fill() method?
  
  – zer00ne
  Mar 25 at 14:49
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks! I tried! I just had to declare 'count' array differently. var count = new Array(arr.length); count.fill(0, 0); but it worked!!
  
  – Lemile
  Mar 25 at 15:07
  
  

  
  
  
  

add a comment | 

0

0

This question already has an answer here:

• 
  Most efficient way to create a zero filled JavaScript array?
  
  38 answers
  
  

I made this code to check out how "random" the random function is.

Array.prototype.random = function() 
 var index = Math.floor(this.length*Math.random());
 return this[index];

var arr = new Array('a', 'b', 'c', 'd', 'e');

var count = [0, 0, 0, 0, 0]; //I want to ask about this part

for (var i = 0; i < 10000; i++) 
 var val = arr.random();
 console.log(val);

 switch (val) 
 case 'a':
 count[0]++;
 break;
 case 'b':
 count[1]++;
 break;
 case 'c':
 count[2]++;
 break;
 case 'd':
 count[3]++;
 break;
 case 'e':
 count[4]++;
 break;
 


for (var i = 0; i < count.length; i++) console.log(count[i]); 

In the process, I couldn't think of better way to initialize the 'count' array. Using that way, it would get really repetitive. I would have to put thousand 0 if my 'arr' has 1000 elements. Can anybody suggest better way for me?

If I don't initialize each element of 'count' array as 0, I get NaN.

javascript

share|improve this question

asked Mar 25 at 14:47

LemileLemile

2033 bronze badges

marked as duplicate by VLAZ, Mark Meyer javascript
Users with the  javascript badge can single-handedly close javascript questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');

$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
transient: false,
position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
dismissable: false,
relativeToBody: true
);
,
function()
StackExchange.helpers.removeMessages();

);
);
);
Mar 25 at 14:58

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  .fill() method?
  
  – zer00ne
  Mar 25 at 14:49
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks! I tried! I just had to declare 'count' array differently. var count = new Array(arr.length); count.fill(0, 0); but it worked!!
  
  – Lemile
  Mar 25 at 15:07
  
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  Most efficient way to create a zero filled JavaScript array?
  
  38 answers
  
  

I made this code to check out how "random" the random function is.

Array.prototype.random = function() 
 var index = Math.floor(this.length*Math.random());
 return this[index];

var arr = new Array('a', 'b', 'c', 'd', 'e');

var count = [0, 0, 0, 0, 0]; //I want to ask about this part

for (var i = 0; i < 10000; i++) 
 var val = arr.random();
 console.log(val);

 switch (val) 
 case 'a':
 count[0]++;
 break;
 case 'b':
 count[1]++;
 break;
 case 'c':
 count[2]++;
 break;
 case 'd':
 count[3]++;
 break;
 case 'e':
 count[4]++;
 break;
 


for (var i = 0; i < count.length; i++) console.log(count[i]); 

In the process, I couldn't think of better way to initialize the 'count' array. Using that way, it would get really repetitive. I would have to put thousand 0 if my 'arr' has 1000 elements. Can anybody suggest better way for me?

If I don't initialize each element of 'count' array as 0, I get NaN.

javascript

share|improve this question

asked Mar 25 at 14:47

LemileLemile

2033 bronze badges

Array.prototype.random = function() 
 var index = Math.floor(this.length*Math.random());
 return this[index];

var arr = new Array('a', 'b', 'c', 'd', 'e');

var count = [0, 0, 0, 0, 0]; //I want to ask about this part

for (var i = 0; i < 10000; i++) 
 var val = arr.random();
 console.log(val);

 switch (val) 
 case 'a':
 count[0]++;
 break;
 case 'b':
 count[1]++;
 break;
 case 'c':
 count[2]++;
 break;
 case 'd':
 count[3]++;
 break;
 case 'e':
 count[4]++;
 break;
 


for (var i = 0; i < count.length; i++) console.log(count[i]); 

share|improve this question

asked Mar 25 at 14:47

LemileLemile

2033 bronze badges

share|improve this question

asked Mar 25 at 14:47

LemileLemile

2033 bronze badges

asked Mar 25 at 14:47

LemileLemile

2033 bronze badges

asked Mar 25 at 14:47

LemileLemile

2033 bronze badges

4 Answers
4

active

oldest

votes

0

You can use the Array#fill() method. For example, to create an array of size 12 entirely filled up with 10s, you can use the following:

const array = new Array(12).fill(10)
console.log(array)

Here's some more documentation on this method.

share|improve this answer

answered Mar 25 at 14:55

KogniseKognise

31622 silver badges1414 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you!! It really helped
  
  – Lemile
  Mar 25 at 15:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You're welcome :) If you want, accept the answer so others who come across your question can find it.
  
  – Kognise
  Mar 25 at 15:20
  

  
  
  
  

add a comment | 

0

If you just need to loop over the arguments passed into the function you can access them with the arguments keyword.

share|improve this answer

answered Mar 25 at 14:50

Jordan AllainJordan Allain

122 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I didn't pass any arguments this time, but I'll try using it next time. :)
  
  – Lemile
  Mar 25 at 15:03
  

  
  
  
  

add a comment | 

0

I'm not exactly sure if that's what you're asking about, but if you want to initialize an array with 1000 same entries, all you need to do is:

var count = new Array(1000).fill(0)

share|improve this answer

answered Mar 25 at 14:53

Michał SadowskiMichał Sadowski

56433 silver badges1212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you so much!! Helped a lot :)
  
  – Lemile
  Mar 25 at 15:18
  

  
  
  
  

add a comment | 

0

You could do the following

var temp = new Array(1000);
var count = temp.fill(0); 

share|improve this answer

answered Mar 25 at 14:54

safwanmohasafwanmoha

16111 silver badge1010 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you too :))))
  
  – Lemile
  Mar 25 at 15:18
  

  
  
  
  

add a comment | 

0

You can use the Array#fill() method. For example, to create an array of size 12 entirely filled up with 10s, you can use the following:

const array = new Array(12).fill(10)
console.log(array)

Here's some more documentation on this method.

share|improve this answer

answered Mar 25 at 14:55

KogniseKognise

31622 silver badges1414 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you!! It really helped
  
  – Lemile
  Mar 25 at 15:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You're welcome :) If you want, accept the answer so others who come across your question can find it.
  
  – Kognise
  Mar 25 at 15:20
  

  
  
  
  

add a comment | 

0

You can use the Array#fill() method. For example, to create an array of size 12 entirely filled up with 10s, you can use the following:

const array = new Array(12).fill(10)
console.log(array)

Here's some more documentation on this method.

share|improve this answer

answered Mar 25 at 14:55

KogniseKognise

31622 silver badges1414 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you!! It really helped
  
  – Lemile
  Mar 25 at 15:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You're welcome :) If you want, accept the answer so others who come across your question can find it.
  
  – Kognise
  Mar 25 at 15:20
  

  
  
  
  

add a comment | 

You can use the Array#fill() method. For example, to create an array of size 12 entirely filled up with 10s, you can use the following:

const array = new Array(12).fill(10)
console.log(array)

Here's some more documentation on this method.

share|improve this answer

answered Mar 25 at 14:55

KogniseKognise

31622 silver badges1414 bronze badges

const array = new Array(12).fill(10)
console.log(array)

const array = new Array(12).fill(10)
console.log(array)

const array = new Array(12).fill(10)
console.log(array)

share|improve this answer

answered Mar 25 at 14:55

KogniseKognise

31622 silver badges1414 bronze badges

answered Mar 25 at 14:55

KogniseKognise

31622 silver badges1414 bronze badges

answered Mar 25 at 14:55

KogniseKognise

31622 silver badges1414 bronze badges

0

If you just need to loop over the arguments passed into the function you can access them with the arguments keyword.

share|improve this answer

answered Mar 25 at 14:50

Jordan AllainJordan Allain

122 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I didn't pass any arguments this time, but I'll try using it next time. :)
  
  – Lemile
  Mar 25 at 15:03
  

  
  
  
  

add a comment | 

0

If you just need to loop over the arguments passed into the function you can access them with the arguments keyword.

share|improve this answer

answered Mar 25 at 14:50

Jordan AllainJordan Allain

122 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I didn't pass any arguments this time, but I'll try using it next time. :)
  
  – Lemile
  Mar 25 at 15:03
  

  
  
  
  

add a comment | 

If you just need to loop over the arguments passed into the function you can access them with the arguments keyword.

share|improve this answer

answered Mar 25 at 14:50

Jordan AllainJordan Allain

122 bronze badges

share|improve this answer

answered Mar 25 at 14:50

Jordan AllainJordan Allain

122 bronze badges

answered Mar 25 at 14:50

Jordan AllainJordan Allain

122 bronze badges

answered Mar 25 at 14:50

Jordan AllainJordan Allain

122 bronze badges

0

I'm not exactly sure if that's what you're asking about, but if you want to initialize an array with 1000 same entries, all you need to do is:

var count = new Array(1000).fill(0)

share|improve this answer

answered Mar 25 at 14:53

Michał SadowskiMichał Sadowski

56433 silver badges1212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you so much!! Helped a lot :)
  
  – Lemile
  Mar 25 at 15:18
  

  
  
  
  

add a comment | 

0

I'm not exactly sure if that's what you're asking about, but if you want to initialize an array with 1000 same entries, all you need to do is:

var count = new Array(1000).fill(0)

share|improve this answer

answered Mar 25 at 14:53

Michał SadowskiMichał Sadowski

56433 silver badges1212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you so much!! Helped a lot :)
  
  – Lemile
  Mar 25 at 15:18
  

  
  
  
  

add a comment | 

I'm not exactly sure if that's what you're asking about, but if you want to initialize an array with 1000 same entries, all you need to do is:

var count = new Array(1000).fill(0)

share|improve this answer

answered Mar 25 at 14:53

Michał SadowskiMichał Sadowski

56433 silver badges1212 bronze badges

var count = new Array(1000).fill(0)

share|improve this answer

answered Mar 25 at 14:53

Michał SadowskiMichał Sadowski

56433 silver badges1212 bronze badges

answered Mar 25 at 14:53

Michał SadowskiMichał Sadowski

56433 silver badges1212 bronze badges

answered Mar 25 at 14:53

Michał SadowskiMichał Sadowski

56433 silver badges1212 bronze badges

0

You could do the following

var temp = new Array(1000);
var count = temp.fill(0); 

share|improve this answer

answered Mar 25 at 14:54

safwanmohasafwanmoha

16111 silver badge1010 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you too :))))
  
  – Lemile
  Mar 25 at 15:18
  

  
  
  
  

add a comment | 

0

You could do the following

var temp = new Array(1000);
var count = temp.fill(0); 

share|improve this answer

answered Mar 25 at 14:54

safwanmohasafwanmoha

16111 silver badge1010 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you too :))))
  
  – Lemile
  Mar 25 at 15:18
  

  
  
  
  

add a comment | 

You could do the following

var temp = new Array(1000);
var count = temp.fill(0); 

share|improve this answer

answered Mar 25 at 14:54

safwanmohasafwanmoha

16111 silver badge1010 bronze badges

var temp = new Array(1000);
var count = temp.fill(0); 

share|improve this answer

answered Mar 25 at 14:54

safwanmohasafwanmoha

16111 silver badge1010 bronze badges

answered Mar 25 at 14:54

safwanmohasafwanmoha

16111 silver badge1010 bronze badges

answered Mar 25 at 14:54

safwanmohasafwanmoha

16111 silver badge1010 bronze badges