Is it possible to check if a value exists inside an array full of objects without looping?

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I Have an array holding multiple objects. Is it posible to check if a value exists in any one of the objects e.g. id->27 without looping? In a similar fashion to PHP's in_array() function. Thanks.

> array(10)[0]=>Object #673 
                     ["id"]=>25 
                     ["name"]=>spiderman   
           [1]=>Object #674
                     ["id"]=>26
                     ["name"]=>superman   
           [2]=>Object #675
                     ["id"]=>27
                     ["name"]=>superman 
           ....... 
           .......
           .........

No. If you often need quick direct lookup of values, you need to use array keys for them, which are lightning fast to lookup. For example:

// prepare once
$indexed = array();
foreach ($array as $object) {
    $indexed[$object->id] = $object;
}

// lookup often
if (isset($indexed[42])) {
    // object with id 42 exists...
}

If you need to lookup objects by different keys, so you can't really index them by one specific key, you need to look into different search strategies like binary searches.

Check if object value exists within a Javascript array of objects and if , Is there a way to loop through the array to check whether a particular username value already exists and if it does do nothing, but if it doesn't to add a new object​  You can use the indexOf () method to check whether a given value or element exists in an array or not. The indexOf () method returns the index of the element inside the array if it is found, and returns -1 if it not found. Let's take a look at the following example:

$results = array_filter($array, function($item){
   return ($item->id === 27);
});
if ($results)
{
   ..  You have matches
}

How to check if an array includes an object in JavaScript , Is it posible to check if a value exists in any one of the objects e.g. id->27 without looping? In a similar fashion to PHP's in_array() function. Thanks. > array(10)[0  The array must be sorted, if Arrays.binarySearch () method is used. In this case, the array is not sorted, therefore, it should not be used. Actually, if you need to check if a value is contained in some array/collection efficiently, a sorted list or tree can do it in O (log (n)) or hashset can do it in O (1). Category >> Array >> Java

You will need to do looping one way or another - but you don't have to manually implement the loop yourself. Have a look at array_filter function. All you need to do is to provide a function that checks the objects, something like this:

function checkID($var)
{
    return $var->id == 27;
}

if(count(array_filter($input_array, "checkID")) {
    // you have at least one matching element
}

Or you can even do this in one line:

if(count(array_filter($input_array, function($var) { return $var->id == 27; })) {
    // you have at least one matching element
}

How to use PHP array functions instead of loops, There are various methods to check an array includes an object or not. Using includes() Method: If array This method returns true if the array contains the object/element else return false. Syntax: if(arr.filter(value=> value==obj).length > 0) Output: full-stack-img How to check a key exists in JavaScript object? How to  In the above program, we have an array of integers stored in variable num. Likewise, the number to be found is stored in toFind . Now, we use a foreach loop to iterate through all elements of num and check individually if toFind is equal to n or not.

array_search — Searches the array for a given value and returns the corresponding key if successful

$key = array_search('your search', $array);

forin, But that doesn't mean that you're using them to their full potential. Meanwhile, anonymous functions only exist to serve these higher-order functions. Like we mentioned It's an array function that lets you filter (thus the name!) the values inside an array. Inside the loop, we use an if statement to check for two things. First  To check if an item exists in an array, please check the following flow for a reference. In my scenario, I am going to check if a button input exists in an array. If Yes, do nothing. If no, add the item to the list. Best regards, Mabel

You can do:

foreach ($array as $value)
{
   if ($value == "what you are looking for")
       break;
}

Collection Types, The loop will iterate over all enumerable properties of the object itself forEach() or the forof loop) when iterating over arrays where the order of access is important. forEach() and forof exist, what might be the use of forin at all? where you want to check if any of those keys hold a particular value. One of the ways would be to use the static method IndexOf of class Array. Dim arr(5) As Integer arr(0) = 1 arr(1) = 3 arr(2) = 5 arr(3) = 7 arr(4) = 8 arr(5) = 5 Dim index1 As Integer = Array.IndexOf(arr, 5) Returns the index of the first occurrence of 5, if found; otherwise, the lower bound of the array minus 1.

How to Check If a Value Exists in an Array in JavaScript, The type of a Swift array is written in full as Array<Element> , where Element is array has specified a value type of String , it is allowed to store String values only. To find out the number of items in an array, check its read-only count property: You can iterate over the entire set of values in an array with the for - in loop:. The Arrays.binarySearch can also be used to check if a given value exists in an array. The benefit of binary search becomes more apparent when the size of the array becomes larger. Below is an example of how to check is an array contains a value using binary search:

Data Structures: Objects and Arrays :: Eloquent JavaScript, How to Check If a Value Exists in an Array in JavaScript The indexOf() method returns the index of the element inside the array if it is found, and returns -1 if it  Find if a value is in a list with formula. Besides the Find and Replace function, you can use a formula to check if a value is in a list. Select a blank cell, here is C2, and type this formula =IF(ISNUMBER(MATCH(B2,A:A,0)),1,0) into it, and press Enter key to get the result, and if it displays 1, indicates the value is in the list, and if 0, that is not exist.

The List of the 10 Most Common Mistakes That PHP Developers , The notation for getting at the elements inside an array also uses square brackets​. A pair of Reading a property that doesn't exist will give you the value undefined . It is possible to assign a value to a property expression with the = operator. To find out what properties an object has, you can use the Object.​keys function. If you need to check if value exists in jquery array then you can do it using jquery inarray function. $.inArray will help you to find and check if value is exists or not. $.inArray function will return the index of element. If element not exist in given array it will return -1.

Comments
  • Don't use !empty($var) when you just mean $var.
  • This is potentially very wasteful, since it does not break once the value is found, but always iterates through all of them.
  • @deceze Agree. The question is how big is his array. If he's dealing with millions of items, this will not be good. If the array contains only a few items (even a few hundred), the impact will be negligible.
  • empty doesn't work on function return values, and there's no need to use it here anyway. A pure boolean comparison is just fine.
  • @deceze I know. I'm not sure what happened there: I edited my post before, removing empty - but it re-appeared. I edited again.
  • While it's a good function, it won't work for OP, because he needs to check a field in the array's values, not the value itself - and array_search doesn't accept comparison function
  • you said without looping through entire array
  • Haha true. I will change appropriately.