Finding Elements in an Array with the find() Method
Let's explore the find() method, including its syntax and applications, with concrete examples to illustrate its functionality.
find()
While the filter() method sifts through an array to uncover all elements meeting a condition, the find() method is tailor-made for a singular mission – discovering and retrieving the first matching element. Here's a closer look at its syntax:
array.find((element, index, array) => {
// Callback body
});
Let's unravel the critical characteristics of the find() method:
- The original array remains unaltered;
- It navigates through the array, scrutinizing each element;
- The method halts upon locating the initial match, returning that specific element;
- Without a matching element, the method returns
undefined.
Find a Task by Order
In this example, the 'find()' method retrieves the task by the 'order' key.
1234567891011const tasks = [ { order: 1, name: "Buy groceries" }, { order: 2, name: "Walk the dog" }, { order: 3, name: "Read a book" }, ]; const firstTask = tasks.find((element) => element.order === 1); console.log("First task:", firstTask.name); // Output: First task: Buy groceries const secondTask = tasks.find((element) => element.order === 2); console.log("Second task:", secondTask.name); // Output: Second task: Walk the dog
1. What is the primary purpose of the find() method?
2. What is a key characteristic of the find() method?
3. What will be the output in the given example below?
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Let's explore the find() method, including its syntax and applications, with concrete examples to illustrate its functionality.
find()
While the filter() method sifts through an array to uncover all elements meeting a condition, the find() method is tailor-made for a singular mission – discovering and retrieving the first matching element. Here's a closer look at its syntax:
array.find((element, index, array) => {
// Callback body
});
Let's unravel the critical characteristics of the find() method:
- The original array remains unaltered;
- It navigates through the array, scrutinizing each element;
- The method halts upon locating the initial match, returning that specific element;
- Without a matching element, the method returns
undefined.
Find a Task by Order
In this example, the 'find()' method retrieves the task by the 'order' key.
1234567891011const tasks = [ { order: 1, name: "Buy groceries" }, { order: 2, name: "Walk the dog" }, { order: 3, name: "Read a book" }, ]; const firstTask = tasks.find((element) => element.order === 1); console.log("First task:", firstTask.name); // Output: First task: Buy groceries const secondTask = tasks.find((element) => element.order === 2); console.log("Second task:", secondTask.name); // Output: Second task: Walk the dog
1. What is the primary purpose of the find() method?
2. What is a key characteristic of the find() method?
3. What will be the output in the given example below?
Tack för dina kommentarer!
