How to log only the elements from second level array from a multidimentional array

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I have the following array and I need to log only the elements from the second level array from it.

var myArr = [1, 2, 3, [10, 11,[1321,3213,[321321, true], "ha"], 133], 4, 5];

The output should be:

mySecondArr = [10, 11, 133];

with the following code, the output will include the third grade and so on arrays

for(i = 0; i < myArr.length; i++){
    if (typeof(myArr[i]) == 'object'){
        console.log(myArr[i])
    }   
}

Thank you in advance!

You can filter by Array.isArray:

const findInnerArr = outerArr => outerArr.find(item => Array.isArray(item));
const myArr = [1, 2, 3, [10, 11,[1321,3213,[321321, true], "ha"], 133], 4, 5];
const output = findInnerArr(myArr)
  .filter(item => !Array.isArray(item));
console.log(output);

Learn JavaScript Multidimensional Array By Examples, The following example defines a two-dimensional array named activities . To access an element of the multidimensional array, you first use square loop the inner array for (var j = 0; j < innerArrayLength; j++) { console.log('[' + i + ',' + j +  I want to generate a list of the second level of keys used. Each record does not contain all of the same keys. But I need to know what all of the keys are. array_keys() doesn't work, it only returns a list of numbers. Essentially the output Im looking for is: action, id, validate, Base, Ebase, Ftype, Qty, Type, Label, Unit

For more 2nd levels, you could filter by array and filter the inner arrays out and concat the result to a single array.

var array = [1, 2, 3, [10, 11, [1321, 3213, [321321, true], "ha"], 133], ['foo', 'bar', ['baz']], 4, 5],
    result = array
        .filter(Array.isArray)
        .map(a => a.filter(b => !Array.isArray(b)))
        .reduce((r, a) => r.concat(a));

console.log(result);

Indexed collections, let arr = [42] // Creates an array with only one element: // the number 42. let arr At the implementation level, JavaScript's arrays actually store their elements as standard forEach(function(element) { console.log(element) }) // first // second Using this characteristic of JavaScript arrays, multi-dimensional  Looping through multidimensional arrays. Just as with regular, single-dimensional arrays, you can use foreach to loop through multidimensional arrays. To do this, you need to create nested foreach loops — that is, one loop inside another: The outer loop reads each element in the top-level array.

@CertainPerformance answer looks much better, but still for your reference, this is your way.

var newArr = [];
for(i = 0; i < myArr.length; i++){
    if (typeof(myArr[i]) == 'object'){
        // second level found
        for(var j=0;j<myArr[i].length;j++){
            if(typeof(myArr[i][j]) != 'object'){
                newArr.push(myArr[i][j]);
            }
        }
        break;
    }
}

array_keys - Manual, If a search_value is specified, then only the keys for that value are returned. Searches the array for a given value and returns the first corresponding key if successful Here's a way to find all the keys from a multidimensional array while keeping the array structure. NOTE: If the sub element isn't an array, it will be ignore. Questions: Is it possible, in PHP, to flatten a (bi/multi)dimensional array without using recursion or references? I’m only interested in the values so the keys can be ignored, I’m thinking in the lines of array_map() and array_values().

Use Array.filter, Array.reduce and Array.isArray

let myArr = [1, 2, 3, [10, 11,[1321,3213,[321321, true], "ha"], 133], 4, 5, ['this', 'should', ['not'], 'be', 'part', 'of', 'result']];

/* 1. Get all the items that are array from myArr
** 2. Reduce that array with pushing non-Array into the result. */
let result = myArr.filter((a) => Array.isArray(a)).reduce((a,c) => [...a, ...c.filter((d) => !Array.isArray(d))], []);

console.log(result);

array_values - Manual, Get all values from specific key in a multidimensional array into each level of the array to order (only the indexed) arrays and NOT flatten the whole thing. You can use ArrayHelper::merge() to merge two or more arrays into one recursively. If each array has an element with the same string key value, the latter will overwrite the former (different from array_merge_recursive()). Recursive merging will be conducted if both arrays have an element of array type and are having the same key.

Recursive mode get any level of the array

function getElementsAt(_array, level, currentLvl=1){
  if(level< 1) throw("level must be > 1");
  if(typeof _array === "undefined") throw("Array or level is undefined");

  
  hasSubLvl = _array.some(e=>{
    return e instanceof Array;
  });
  if(currentLvl!== level){
  const __array = _array.filter(e =>{
      return e instanceof Array;
    })[0];
    return getElementsAt(__array, level, currentLvl+1);
  }
  else{
    return !hasSubLvl ? _array : _array.filter(e =>{
    	return !(e instanceof Array);
    });
  }
}

const arr = [1, 2, 3, [10, 11,[1321,3213,[321321, true], "ha"], 133], 4, 5];
const myArr = getElementsAt(arr, 2);

console.log(myArr, "result");

MTS, Michigan Terminal System, Multidimensional arrays, however, will only be defined one-dimensionally for The formula for accessing a particular element of a two-dimensional array is "i+(j-​1)*n", where "i" represents the first subscript, "j" represents the second subscript,​  I need to initialize only the second level of a two-d array in cobol and preserve the filrst level without looping using a perform varying statement to the second level. Is there any way without using the subscript? Ex - 01 ws-item-count occurs 9 times. 05 ws-item-1 X(1). 05 ws-item-2 x(2). 05 ws-item-3 occurs 4 times. 10 ws-it3-a1 X(01).

Multidimensional array in JavaScript, How to force Input field to enter numbers only using JavaScript ? array then we need to create a multidimensional array by using another one-dimensional array. Removing elements in Multidimensional Array: We can use pop() methods to remove elements salary of 2nd person : 30000 salary of 4th person : 28000 In the last lesson I gave you a general overview of multi-dimensional arrays and how they are implemented in memory. Each programming language implements arrays somewhat differently, and the topic of this lesson is how to actually implement a two dimensional array in C.

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Comments
  • what do you mean by second level array ? Can you give us some example ?
  • By second level array, he means the array at index 3 in myArr
  • by second level I've referred only to the elements in the first array to be found in the main array, example: [1,[2,3,[10],4],999] and the output should be displaying only [2, 3, 4] not [2, 3, [10], 4]
  • what should happens with more than one 2nd level arrays?
  • In case of multi-first level arrays, code will not work.