How do I take first value of sub-array in an array?

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find subarray with given sum

Let's say my nested array is in the format [latitude, longitude] and the array that I want to input is [[10,20],[30,40],[50,60]].

I want to return an array of only latitudes so [10, 30, 50] Now how do I do this in JavaScript?

You could use the .map() method like so:

var array = [[10,20],[30,40],[50,60]];

var result = array.map(item => item[0]);

console.log(result)

Find subarray with given sum, The following solutions print first such subarray. of array to get all subarray starting from i, keep a varibale sum to calculate the sum value of first element and. It will return a sub array from original array with elements from index first to last – 1. Let’s use this to select different sub arrays from original Numpy Array . Contents of the original numpy Numpy Array we created above i.e. npArray is as follows,

Another way to get the same result;

const arr = [[10,20],[30,40],[50,60]];
const latitudes=[];
for (let i = 0; i < arr.length; i++){
   const arr1 = arr[i];

  latitudes.push(arr1[0]); 

 }

array_keys - Manual, Here's how to get the first key, the last key, the first value or the last value of a (​hash) array without explicitly copying nor altering the original array: <?php $array​  Minimum number of swaps required to sort an array of first N number; Efficiently merging two sorted arrays with O(1) extra space and O(NlogN + MlogM) Split the given string into Primes : Digit DP; Maximum number of unique values in the array after performing given operations; Check if sum of Fibonacci elements in an Array is a Fibonacci number or not

Support in : Chrome(yes) , Firefox(yes), IE5.5+ ,O(yes),Safari(yes)

var arr = [[10,20],[30,40],[50,60]] ;
var i = 0 , res = [] ;

while (i < arr.length ) {
  res.push(arr[i][0]) ;
  i++ ;
}

console.log (res) ;

array_column - Manual, (PHP 5 >= 5.5.0, PHP 7). array_column — Return the values from a single column in the input array Example #1 Get the column of first names from a recordset. <?php // Array $result = array(); foreach ($array as $subarray => $​value) { In a real-word, commercial-quality application, you would first test to ensure that the array Arr has actually been allocatedand the the array is single-dimensional. You can use the IsArrayAllocatedand NumberOfArrayDimensionsfunctions, described on the Functions For VBA Arrayspage, to test these conditions.

With ES6 you can also use destructuring & map to get it to this:

var arr = [[10,20],[30,40],[50,60]];

var result = arr.map(([a]) => a)

console.log(result)

Array Subscript Ranges, Subscript ranges are used to select a subarray from an array by giving the of A. The fast way uses a scalar subscript specifying the first element (the 5th) to be  Minimum number of swaps required to sort an array of first N number; Efficiently merging two sorted arrays with O(1) extra space and O(NlogN + MlogM) Split the given string into Primes : Digit DP; Check if sum of Fibonacci elements in an Array is a Fibonacci number or not; Maximum number of unique values in the array after performing given operations

You can use array#map with array#destructuring to get the first index item from the individual array.

var locations = [[10,20],[30,40],[50,60]],
    latitudes = locations.map(([latitude]) => latitude);
console.log(latitudes)

JavaScript Array slice() Method, start, Optional. An integer that specifies where to start the selection (The first element has an index of 0). Use negative numbers to select from the end of an array. Maximum number of unique values in the array after performing given operations; Count of subarrays of an Array having all unique digits; Number of pairs in an array with the sum greater than 0; Count of subsets with sum equal to X using Recursion; Count of subarrays having exactly K distinct elements; Find XOR of all elements in an Array

Index Array Function - LabVIEW 2018 Help, Returns the element or subarray of n-dimension array at index. input unwired for a 1D array, the Index Array function returns the first element of the array. Simply use LINQ sequence methods like Take() to get what you want out of it (don't forget to include the Linq namespace with using System.Linq;): byte[] foo = new byte[4096]; var bar = foo.Take(41); If you really need an array from any IEnumerable<byte> value, you could use the ToArray() method for that. That does not seem to be the case here.

Python Numpy : Select an element or sub array by index from a , It will return a sub array from original array with elements from index first to last – 1. Let's use this to select different sub arrays from original  In this post, we will discuss several methods to get subarray of a non-primitive array between specified indices. 1. Arrays.copyOfRange() The standard way to get subarray of an array is to use the Arrays.copyOfRange() which returns a subarray containing the specified range from the original array as shown below.

Arrays, We can get an element by its number in square brackets: let fruits Extracts the first element of the array and returns it: A maximal subarray. The above statement assigns the 5 th element in the array with a value of 50.0. All arrays have 0 as the index of their first element which is also called the base index and the last index of an array will be total size of the array minus 1. Shown below is the pictorial representation of the array we discussed above − Accessing Array Elements

Comments
  • This is how you do it, for loops are not.