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In python, I can join elements in an array by doing:
print(a)
b=' '.join(a)
print(b)
and I get:
['hhhh', 'hhhh']
hhhh hhhh
How would I do this in js?
It's the same thing, man!
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/join
b = a.join(' ')
If you want join arrays:
let a ='hhhh';
let b = [].concat(a);
b.concat(a)
If you want to join string
let sth = "a" + " b";
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I need to find difference between two strings.
string newemails = peter#xyz.com,john#xyz.com,harry#xyz.com,prince#xyz.com;
string oldemails = peter#xyz.com,john#xyz.com,johnson#xyz.com,harry#xyz.com,prince#xyz.com;
The expected output is johnson#xyz.com and log it to the new string.
Is there any way to do this in JavaScript?
You can split the strings by comma, then filter out the newemails from the oldemails:
var newemails = 'peter#xyz.com,john#xyz.com,harry#xyz.com,prince#xyz.com';
var oldemails = 'peter#xyz.com,john#xyz.com,johnson#xyz.com,harry#xyz.com,prince#xyz.com';
var newemailsArr = newemails.split(',');
var diff = oldemails.split(',').filter(m => !newemailsArr.includes(m)).join(',');
console.log(diff);
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I have a requirement where i will get the input from the user. He can enter
"features1,feature2",feature3,"feature4"
something like this. I'm using this
let arr: any = message.split(/,(?=(?:(?:[^"]*"){2})*[^"]*$)/)
to split the string and i'm getting result like
[""feature1,feature2"","feature3",""feature4""]
but i want the result like this
["feature1,feature2","feature3","feature4"]
I don't thing what you're trying to achieve is possible only using split function.
After you split, loop over the error and replace " with `` (empty).
const message = `"features1,feature2",feature3,"feature4"`;
let arr = message.split(/,(?=(?:(?:[^"]*"){2})*[^"]*$)/);
arr = arr.map(el=>el.replace(/"/g,''));
console.log(arr);
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What I have:
add-category
add-exam
a-category1
a-category2
...
a-category[n]
What I need:
I need to cut string on two parts as 'a-category' and '1' or just 'add-exam' if no digit in row.
let str = 'a-category2';
let splitStr = str.split(/(\d+)/);
console.log('string--->' + splitStr[0]);
console.log('digit---->' + splitStr[1]);
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^[a-zA-Z]\w+#[a-zA-Z_]+?\.[a-zA-Z]{2,4}$
i had tried this regex for email but it allow following cases
123#mail.com
example.mail#mail.com
Here is the code which searches for the number at the start.
If number is matched it prints message in console.
let regex = /^[0-9]/;
let object = [{email:'123#mail.com'},{email:'example.mail#mail.com'}];
for(let i =0;i<object.length;i++){
if(object[i].email.match(regex)){
console.log('E-mail ',object[i].email,' is not valid.')
}
}
This is the used regex: ^[0-9]
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I have a two textbox and i want to convert string value such as "apple" and "cat" into appropriate integer value using javascript.
Simple...
var myInt = "cat";
var converted = parseInt(myInt, 10);
console.log(converted);
>>NaN