Remove an array from an array of arrays
I have this array of array:
var results = [ [#null, null], ['miglioramento', 30], ['correttiva',45] ];
I want to remove the first array: [#null, null] from results because I want to achieve this array:
results = [ ['miglioramento', 30], ['correttiva',45] ];
How can I do this?
I really thank you in advance!
Assuming the first entry of your array is
[null, null] not
[#null, null]. This way you are filtering all empty arrays containing only
null as entries.
results.filter((arr) => arr.filter((entry) => entry !== null).length);
You can use
const array = [0, 1, 2, 3] const slicedArray = array.slice(1) console.log(slicedArray) // print : [1, 2, 3]
Removing Duplicate Arrays from an Array of Arrays, What if the array items with potential duplicates were themselves arrays? How will we both identify the duplicate arrays and also remove those duplicates to� Using System.arraycopy () method to delete array element. You can use System.arraycopy () method to remove element from an array in Java. Once you know the index of the element that has to be removed you can call System.arraycopy () method twice, once for copying the element from 0 till the index and then from index + 1 till the end of the array.
create a function to check if an arry is all null then call it inside a filter function.
var results = [ [null, null], ['miglioramento', 30], ['correttiva', 45] ]; const checkNull = arr => arr.every(el => el != null); const res = results.filter(el => checkNull(el)); console.log(res);
For inner arrays with only two elements, you can use
.filter() and destructure the elements to check whether one of the elements isn't equal to
null. If this is the case, your filter predicate will return
true, which will keep the inner array.
const data = [[null, null], ['miglioramento', 30], ['correttiva',45]]; const res = data.filter(([e1, e2]) => e1 !== null || e2 !== null); console.log(res);
var results = [ [null, null], ['miglioramento', 30], ['correttiva',45] ] results.shift() console.log(results)
There are a few approaches we can take to remove the duplicate content arrays from our parent array. While we can take a more brute-force approach and compare each array’s contents with every other array’s contents to identify duplicates, we can take another approach and rely on the Set object and its natural ability to filter out duplicate
2:40 To remove an element from the end of the array, I'll type numbers.pop. 2:44 Notice how I'm not passing any arguments to the pop method. 2:51 The pop method does not accept arguments. 2:54 Remember, pop returns the last element after removing it. 2:57 This returns 600 because the value 600 was the last element in the numbers array.
#nullis not a valid syntax
- The # is only to clarification purpose, right?
- Will that
[ null, null ]array always be the first item within the parent array?
- if you want your result to "achieve this array" then set your result to the array you want...?
- That will only work when the array of nulls is the first element