Remove elements from a JavaScript Array

By: Rajesh P.S.

Removing a specific item from an array in JavaScript involves identifying the index of the item and then using array manipulation methods to achieve the removal. Let's investigate into the details with examples:

Removing an Item using splice()

The splice() method is commonly used to remove elements from an array by specifying the index and the number of elements to remove.

const fruits = ["apple", "banana", "orange", "grape"]; const itemToRemove = "banana"; const index = fruits.indexOf(itemToRemove); if (index !== -1) { fruits.splice(index, 1); } console.log(fruits); // Output: ["apple", "orange", "grape"]

Removing an Item using filter()

The filter() method creates a new array with elements that pass a certain condition, effectively excluding the item to be removed.

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const fruits = ["apple", "banana", "orange", "grape"]; const itemToRemove = "banana"; const filteredFruits = fruits.filter(fruit => fruit !== itemToRemove); console.log(filteredFruits); // Output: ["apple", "orange", "grape"]

Removing an Item using slice() and concat():

The slice() method can be used to split the array into two parts before and after the item to be removed, and then concat() is used to merge the parts back together.

const fruits = ["apple", "banana", "orange", "grape"]; const itemToRemove = "banana"; const index = fruits.indexOf(itemToRemove); if (index !== -1) { const before = fruits.slice(0, index); const after = fruits.slice(index + 1); const updatedFruits = before.concat(after); console.log(updatedFruits); // Output: ["apple", "orange", "grape"] }

Conclusion

To remove a specific item from an array in JavaScript, consider using methods like splice(), filter(), or a combination of slice() and concat(). The choice of method depends on your requirements and coding style preferences.

Next > What is JavaScript closures?

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