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Arrray fill vs looping thru.

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  Arrray fill vs looping thru. jonas.thornvall@gmail.com - 2017-11-04 04:11 -0700
    Re: Arrray fill vs looping thru. jonas.thornvall@gmail.com - 2017-11-04 04:20 -0700
      Re: Arrray fill vs looping thru. jonas.thornvall@gmail.com - 2017-11-04 04:29 -0700
        Re: Arrray fill vs looping thru. JJ <jj4public@vfemail.net> - 2017-11-04 18:53 +0700
    Re: Arrray fill vs looping thru. jonas.thornvall@gmail.com - 2017-11-04 05:06 -0700
      Re: Arrray fill vs looping thru. jonas.thornvall@gmail.com - 2017-11-04 05:24 -0700

#34268 — Arrray fill vs looping thru.

Could i use array fill instead of loop thru filling up values but how would i set offset?

offset=0;
for (var i=0;i<numberofvalues){
dval.Array(countval[i]).fill(i);
offset=offset+countval[i];
}

But i do not understand can i set an offset with fill, so as you see i never use it above. 

***HOW DO I MAKE THE FILL AT THE START ENTRY USING OFFSET***?
Is the fill function faster then using loop thru, i save a loop?

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#34269

Den lördag 4 november 2017 kl. 12:11:37 UTC+1 skrev jonas.t...@gmail.com:
> Could i use array fill instead of loop thru filling up values but how would i set offset?
> 
> offset=0;
> for (var i=0;i<numberofvalues){
> dval.Array(countval[i]).fill(i);
> offset=offset+countval[i];
> }
> 
> But i do not understand can i set an offset with fill, so as you see i never use it above. 
> 
> ***HOW DO I MAKE THE FILL AT THE START ENTRY USING OFFSET***?
> Is the fill function faster then using loop thru, i save a loop?

This is the original code i try to replace, the index of countval represent "a stored value" then actual element at each index "is number of occurences of stored value", can i remove the innerloop below using fill?
And will it be faster?

I would be glad on some help howto use fill with an offset. 
I do understand that Array(3).fill(4) will fill element 1-3 in whatever array with 4,4,4 but that is index 0,1,2? how can i set an offset "startpoint".

JT



for (var j=start;j<end;j++){ 
temp=countval[j] 
for (var k=0;k<temp;k++){ 
dval[p]=j; 
p++;
} 
}

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#34270

Den lördag 4 november 2017 kl. 12:20:47 UTC+1 skrev jonas.t...@gmail.com:
> Den lördag 4 november 2017 kl. 12:11:37 UTC+1 skrev jonas.t...@gmail.com:
> > Could i use array fill instead of loop thru filling up values but how would i set offset?
> > 
> > offset=0;
> > for (var i=0;i<numberofvalues){
> > dval.Array(countval[i]).fill(i);
> > offset=offset+countval[i];
> > }
> > 
> > But i do not understand can i set an offset with fill, so as you see i never use it above. 
> > 
> > ***HOW DO I MAKE THE FILL AT THE START ENTRY USING OFFSET***?
> > Is the fill function faster then using loop thru, i save a loop?
> 
> This is the original code i try to replace, the index of countval represent "a stored value" then actual element at each index "is number of occurences of stored value", can i remove the innerloop below using fill?
> And will it be faster?
> 
> I would be glad on some help howto use fill with an offset. 
> I do understand that Array(3).fill(4) will fill element 1-3 in whatever array with 4,4,4 but that is index 0,1,2? how can i set an offset "startpoint".
> 
> JT
> 
> 
> 
> for (var j=start;j<end;j++){ 
> temp=countval[j] 
> for (var k=0;k<temp;k++){ 
> dval[p]=j; 
> p++;
> } 
> }

But how does fill work with statement like Array(0).fill(4) will it still make the function call that would be a waste so i hope not?

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#34271

On Sat, 4 Nov 2017 04:29:44 -0700 (PDT), jonas.thornvall@gmail.com wrote:

> Den lördag 4 november 2017 kl. 12:20:47 UTC+1 skrev jonas.t...@gmail.com:
>> Den lördag 4 november 2017 kl. 12:11:37 UTC+1 skrev jonas.t...@gmail..com:
>>> Could i use array fill instead of loop thru filling up values but how would i set offset?
>>> 
>>> offset=0;
>>> for (var i=0;i<numberofvalues){
>>> dval.Array(countval[i]).fill(i);
>>> offset=offset+countval[i];
>>> }
>>> 
>>> But i do not understand can i set an offset with fill, so as you see i never use it above. 
>>> 
>>> ***HOW DO I MAKE THE FILL AT THE START ENTRY USING OFFSET***?
>>> Is the fill function faster then using loop thru, i save a loop?
>> 
>> This is the original code i try to replace, the index of countval represent "a stored value" then actual element at each index "is number of occurences of stored value", can i remove the innerloop below using fill?
>> And will it be faster?
>> 
>> I would be glad on some help howto use fill with an offset. 
>> I do understand that Array(3).fill(4) will fill element 1-3 in whatever array with 4,4,4 but that is index 0,1,2? how can i set an offset "startpoint".
>> 
>> JT
>> 
>> for (var j=start;j<end;j++){ 
>> temp=countval[j] 
>> for (var k=0;k<temp;k++){ 
>> dval[p]=j; 
>> p++;
>> } 
>> }
> 
> But how does fill work with statement like Array(0).fill(4) will it still make the function call that would be a waste so i hope not?

Check the MDN reference for the `fill()` method.

<https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill>

You should bookmark that site too, since it's a pretty good reference for
most web specifications.

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#34272

Den lördag 4 november 2017 kl. 12:11:37 UTC+1 skrev jonas.t...@gmail.com:
> Could i use array fill instead of loop thru filling up values but how would i set offset?
> 
> offset=0;
> for (var i=0;i<numberofvalues){
> dval.Array(countval[i]).fill(i);
> offset=offset+countval[i];
> }
> 
> But i do not understand can i set an offset with fill, so as you see i never use it above. 
> 
> ***HOW DO I MAKE THE FILL AT THE START ENTRY USING OFFSET***?
> Is the fill function faster then using loop thru, i save a loop?

I think i get it

Example fruits.fill("Kiwi", 2, 4)

offset=0;
for (var i=0;i<numberofvalues){
dval.Array(countval[i]).fill(i,offset,offset+countval[i]);
offset=offset+countval[i];
}

Does it seem reasonable?

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#34273

Den lördag 4 november 2017 kl. 13:07:08 UTC+1 skrev jonas.t...@gmail.com:
> Den lördag 4 november 2017 kl. 12:11:37 UTC+1 skrev jonas.t...@gmail.com:
> > Could i use array fill instead of loop thru filling up values but how would i set offset?
> > 
> > offset=0;
> > for (var i=0;i<numberofvalues){
> > dval.Array(countval[i]).fill(i);
> > offset=offset+countval[i];
> > }
> > 
> > But i do not understand can i set an offset with fill, so as you see i never use it above. 
> > 
> > ***HOW DO I MAKE THE FILL AT THE START ENTRY USING OFFSET***?
> > Is the fill function faster then using loop thru, i save a loop?
> 
> I think i get it
> 
> Example fruits.fill("Kiwi", 2, 4)
> 
> offset=0;
> for (var i=0;i<numberofvalues){
> dval.Array(countval[i]).fill(i,offset,offset+countval[i]);
> offset=offset+countval[i];
> }
> 
> Does it seem reasonable?
Well this look better "correct"

offset=0; 
for (var i=0;i<numberofvalues;i++){ 
dval.fill(i,offset,offset+countval[i]); 
offset=offset+countval[i]; 
}
I think i got it to work, but the timing seem to be the same, but this is very few occurences on every entry 0-3, if the sample data more dense it could give positive effects?

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