Get index of object in array javascript
The See also the
Parameters
A function used to test elements in the array. The function is called with the following arguments: element The current element being processed in the array. index The index of the current element being processed in the array. array The array The callback must return a truthy value to indicate an appropriate element has been found. The index of this element is then returned by thisArg
Optional
Optional object to use as Return valueThe index of the first element in the array that passes the test. Otherwise, DescriptionThe If such an element is
found, Note: Unlike other array methods such as
If a The range of elements processed by Warning: Concurrent modification of the kind described in the previous paragraph frequently leads to hard-to-understand code and is generally to be avoided (except in special cases). ExamplesFind the index of a prime number in an arrayThe following example returns the index of the first element in the array that is a prime number, or
Find index using arrow functionThe following example finds the index of a fruit using an arrow function:
Specifications
Browser compatibilityBCD tables only load in the browser See alsoHow do you find the index of an object in an array in TypeScript?TypeScript - Array indexOf()
indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
How do you get the index of an element in a list in JS?The indexOf() method returns the first index (position) of a specified value. The indexOf() method returns -1 if the value is not found. The indexOf() method starts at a specified index and searches from left to right. By default the search starts at the first element and ends at the last.
How do I find the index of an object key?Explanation. Use .map() to get an array of values given a particular key: var values = object_array. map(function(o) { return o. your_key; }); ... . Now we just use .indexOf() to find the index of the key we want (which is, of course, also the index of the object we're looking for): var index = values. indexOf(your_value);. How does findIndex work in JavaScript?The findIndex() method executes the callbackFn function once for every index in the array, in ascending order, until it finds the one where callbackFn returns a truthy value. If such an element is found, findIndex() immediately returns the element's index.
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