Question 409503 in Javascript Question posted in
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Javascript – js nested Array get first array last elment,second array second element and 3 array first element

javascript multidimensional Array get first array last elment,second array second element and 3 array first element
input array=[[1,2,3],[4,5,6],[7,8,9]];
output= [3,5,7];

how to get output with loop in multidimensional array

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3

Answers


  1. 0

    To get the specific elements from your multidimensional array using a loop in JavaScript, you can access the elements by specifying their indices. Here’s how you can do it:

    const inputArray = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
const output = [];

for (let i = 0; i < inputArray.length; i++) {
    if (i === 0) {
        // Get the last element of the first array
        output.push(inputArray[i][inputArray[i].length - 1]);
    } else if (i === 1) {
        // Get the second element of the second array
        output.push(inputArray[i][1]);
    } else if (i === 2) {
        // Get the first element of the third array
        output.push(inputArray[i][0]);
    }
}

console.log(output); // Output: [3, 5, 7]

    Explanation:

    • We loop through the outer array using a for loop.
    • For each iteration, we check which array we are in (using the index i):
      • If i is 0, we push the last element of the first array (inputArray[0][inputArray[0].length - 1]).
      • If i is 1, we push the second element of the second array (inputArray[1][1]).
      • If i is 2, we push the first element of the third array (inputArray[2][0]).

    This gives you the desired output: [3, 5, 7].

    This answer could definitely be made to be more scalable, but I wasn’t sure if you wanted it to be more dynamic or just to fit this specific case.

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  2. 0

    You could try to loop with 2 indexes:

    const input = [[1,2,3],[4,5,6],[7,8,9]];

let i = input[0].length, n = 0;
const result = [];
while(i--){
  result.push(input[n++][i]);
}

console.log(result);
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  3. 0

    You could try to loop with 2 indexes:

    const
  input  = [[1,2,3],[4,5,6],[7,8,9]]
, result = []
  ;
for (let p=input.length, i=0; p--; i++)
  result.push(input[i][p]);
  
console.log(result);
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