Tag: arrays

How to find first non null value in a typescript array?

I have an arr variable which looks as below: I want to print out the first non-null value from within the arr array variable. In above array, the output should be hello I have written following logic but it is not giving the correct result: Answer Just use find: It returns the value of the first element in the provided

Electron, Javascript: How to select an array within an array returned by the database

arraylist arrays electron javascript promise

I want to foreach an array to show on the screen. This array is the data from a database table. The code to get this data: But this variable comes this way: And I’m not able to select that array (_rejectionHandler0) Answer Since .query also returns a Promise, you need to await it. await conn waits for the connection to

Decode the Morse code, advanced JS (codewars)

arrays javascript math morse-code

Here is a task: When transmitting the Morse code, the international standard specifies that: “Dot” – is 1 time unit long. “Dash” – is 3 time units long. Pause between dots and dashes in a character – is 1 time unit long. Pause between characters inside a word – is 3 time units long. Pause between words – is 7

Mapping array with objects of open hours in react

arrays javascript json reactjs

So Im trying to render in jsx a list of 7 days with open hours, taking data from my json file. I want to make it looks somehow like this: Mon 09:00 – 21:00 Tue 09:00 – 21:00 Wed 09:00 – 21:00 Thu 09:00 – 21:00 Fri 09:00 – 21:00 Sat 11:00 – 21:00 Sun 11:00 – 21:00 In my

Reverse iteration in a jQuery Object?

arrays iteration javascript jquery object

Now while I iterate, I want to get ‘s’ first- I have tried test_data.revers() which does not work. Any solution? Answer For a defined order, you could sort the keys of the object and iterate them in descending order of the first value of the array.

Conjoin Related Objects Into One Object Array? (javascript)

arrays javascript json object reactjs

I have some user and permission data that has been queried from my database. I would like the access object for each person to be conjoined with each user object so that when I map through the array in my app on a user permissions page, all the data is easily accessible. Fortunately, my data that needs to be conjoined

reduce array of array into a flat array of object

arrays ecmascript-6 javascript typescript

I’m stuck at transforming a data structure: How can I produce this? Answer Here is one way to do it with simple reduce,

Updating react state when receiving an array of object

arrays javascript reactjs

I am using an axios.get to make a call to my MongoDB. My response from the DB is an array of objects containing all the data from the database. I am only trying to save the username of each user to state. I am trying to set the response (res.data.username) to my state however when i log my state I

Javascript show specific array data from global array data

arrays javascript jquery

I need to show specific array data from my global array. So on that code above, I need to take out/hide Hiking with time 19:00. Here is the loop JS: and table HTML: I tried to run the code, Hiking is hide now but the time is not hide. Answer Here is the code, one more if statement check.

how to store the string “1+2+3” as an array like [“1″,”+”,”2″,”+”,”3″] in javascript?

arrays javascript splice split string

I am trying to convert the whole string into an array. Then use the splice to edit the numArr Then change the original string, numbers Answer You could split the string with nonnumber characters.