Скачать или смотреть Find() and FindIndex() in JavaScript - #56

#JavaScript #Find #FindIndex #ArrayFunctions #WebDevelopment #CodingTips

find() Function:
The find() function in JavaScript returns the value of the first element in the array that satisfies the provided testing function. Otherwise, it returns undefined.

Syntax:
JavaScript code:
array.find(callback(element, index, array), thisArg)
callback: A function to test each element of the array. It takes three arguments:
element: The current element being processed in the array.
index (Optional): The index of the current element being processed.
array (Optional): The array find() was called upon.
thisArg (Optional): An object to which the this keyword can refer in the callback function. If omitted, undefined is used.
Description:
The find() function executes the provided callback function once for each element in the array until it finds one where callback returns a truthy value. If such an element is found, find() immediately returns the value of that element. Otherwise, it returns undefined.

Advantage:
Returns the value of the first element that satisfies the condition, which can be useful for searching arrays.

Disadvantage:
Stops iteration once the first matching element is found, so it may not find all matching elements.
findIndex() Function:
The findIndex() function in JavaScript returns the index of the first element in the array that satisfies the provided testing function. Otherwise, it returns -1.

Syntax:
JavaScript code:
array.findIndex(callback(element, index, array), thisArg)
callback: A function to test each element of the array. It takes three arguments:
element: The current element being processed in the array.
index (Optional): The index of the current element being processed.
array (Optional): The array findIndex() was called upon.
thisArg (Optional): An object to which the this keyword can refer in the callback function. If omitted, undefined is used.

Description:
The findIndex() function executes the provided callback function once for each element in the array until it finds one where callback returns a truthy value. If such an element is found, findIndex() immediately returns the index of that element. Otherwise, it returns -1.

Difference:
find() returns the value of the first matching element, while findIndex() returns the index of the first matching element.

Advantage:
Returns the index of the first element that satisfies the condition, which can be useful for locating elements in an array.

Disadvantage:
Stops iteration once the first matching element is found, so it may not find all matching elements.
Example:
JavaScript code
const numbers = [1, 2, 3, 4, 5];

const foundValue = numbers.find(element = element 2);
console.log(foundValue); // Output: 3

const foundIndex = numbers.findIndex(element = element 2);
console.log(foundIndex); // Output: 2
In this example, find() returns the first element greater than 2, which is 3, and findIndex() returns the index of that element, which is 2.

Chapter :
00:00 Introduction
00:17 Syntax
00:45 Example
01:41 Summery

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