JS create new array from certain item

Question

I have 2 dimensional array myArray:

[
  [ '567576', 'John', 'Doe' ],
  [ '098897', 'John', 'Doe' ],
  [ '543539', 'John', 'Doe' ],
  [ '234235', 'John', 'Doe' ],
  [ '345348', 'John', 'Doe' ],
  [ '432574', 'John', 'Doe' ]
]

Is it possible to create a new array from myArray starting from a certain first value? For example create a new array starting from id 543539. Anything above the array containing 543539 will not be added.

SO isn't a coding service; what have you attempted here? I'd look into Array.map() and Array.filter(). — mykaf
– mykaf, Commented Jul 18, 2022 at 17:39
NewArray = myArray.slice(myArra.findIndex((el)=>el[0]==543539)) — Karthikeyan
– Karthikeyan, Commented Jul 18, 2022 at 17:42

rjumatov · Accepted Answer · 2022-07-18 17:39:20Z

1

You can make use of findIndex() which returns the index of the first item that matches the condition. Combine it with slice() to cut your array at the specific position:

const myArray = [
  ['567576', 'John', 'Doe'],
  ['098897', 'John', 'Doe'],
  ['543539', 'John', 'Doe'],
  ['234235', 'John', 'Doe'],
  ['345348', 'John', 'Doe'],
  ['432574', 'John', 'Doe']
]

console.log(myArray.slice(myArray.findIndex(item => item[0] === "543539")));

answered Jul 18, 2022 at 17:39

rjumatov

3,5102 gold badges20 silver badges32 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

ethandjay · Accepted Answer · 2022-07-18 17:39:56Z

0

Sure, assuming all the internal arrays are structured the same way, you can do something like let newArray = myArray.filter(innerArray => Number(innerArray[0]) > 543539)

Edit: This is assuming you want all subarrays where the first item is a number larger than 54539, as opposed to finding all of the subarrays that physically follow the first occurrence of a subarray with 54539 as the first value

answered Jul 18, 2022 at 17:39

ethandjay

617 bronze badges

Comments

pape saliou ka · Accepted Answer · 2022-07-18 17:41:10Z

0

Yes, that is possible and straightforward process. You can use the javascript map method which returns a new array

newArray = myArray.map(item=> item[0])

answered Jul 18, 2022 at 17:41

pape saliou ka

5125 silver badges8 bronze badges

Collectives™ on Stack Overflow

JS create new array from certain item

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related