How many elements in this array [,,]? [closed] - javascript

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In Javascript,
can someone explain to me why
[,,] has 2 undefines elements and not three
[1,1,1] - has 3 elements so why [,,] has only two!

Actually it is from the definition in ES6, If you do not write anything after the last comma, then the item doesn't count for length.

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How to increment a 4 decimal place value in Javascript? [closed]

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How do you increment a currency fractional part?
For instance, let's say you have 14.0009 and you want to increment it to 14.0010 when press the up arrow key
If you are using a HTML5 Input number field then set the step attribute to step="0.0001".
See more: https://www.w3schools.com/tags/att_input_step.asp
See more: https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step

extracting letters from an array of strings [closed]

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I have an array of strings denoting variants of shirts in my store.
Here is an example string:
Apparel-DTG-Tshirt-District-DT6000-M-Black-Mens-CF-20200304113232677
All of the strings share same structure and the rule that I need to implement is, extract what's in between 5th and 6th occurrence of - (dash). In this particular case this is M.
How do I do that?
This would help you. The first capturing group will be the value between fifth and sixth dash:
https://regex101.com/r/UlQBqy/2
const re = /^(?:[^-]*-){5}(.*?)(?=-)/
console.log("Apparel-DTG-Tshirt-District-DT6000-M-Black-Mens-CF-20200304113232677".match(re)[1])

Jquery comma separated array in one line to comma separeted array on multiple lines [closed]

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I do have an array inside Jquery(red array) on one line.
I do want it like the blue array seperated on multiple lines.
The red array needs to be like the blue array on the image.
Can some tell me how to do that, tried a lot of thing.
Try this:
var new_array = your_array[0].split(',');//["500,505,506...."]
console.log(new_array);//[500,505,506]

Are (/\s{2,}/) and (/\s{2,''}/) the same? If not then please explain the difference [closed]

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I just wanted to know difference between (/\s{2,}/) and (/\s{2,''}/) regular expressions?
Please explain with an example.
Are \s{2,} and \s{2,''} the same?
NO, both are different.
\s{2,} --> Two or more spaces.
\s{2,''} --> Matches a white space character[\r\n\t\f] and literal {2,''}

what does document.createElement("_") do in javascript [closed]

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Please have a look at https://github.com/eligrey/classList.js/blob/master/classList.js :
if ("document" in self && !("classList" in document.createElement("_"))) {
//...
}
What is the purpose of document.createElement("_")? I know it creates an html element, but why use _ instead of an html element name?
It creates an element with the tag <_>. I see no reasonable purpose to this.

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