How to Remove First Element from Array in JavaScript2 Mar 2025 | 4 min read What is an Array?In JavaScript, an array is a type of data structure that we use to store a collection of elements that can be of different types. These data types can include strings, numbers, Booleans (true or false), other arrays and objects. Example: Now, if you want to access an element from an array, you need to reference the array name, followed by a pair of square brackets containing the index of the element you want to access. Array are zero-indexed which means the first element in the array has an index of 0, the second element has an index of 1, and so on. How to remove the first element from the array?If you want to remove the first element of an array, then you need to use some methods that are present in JavaScript. They can be beneficial in scenarios such as data processing, data filtering, or manipulation. There are some approaches that can be used for removing the first element from the array, such as: Using Slice() methodWith the help of the slice method in JavaScript, we can create a new array with the use of extracting a portion of an existing array. with the use of the slice method, we can take an element starting from the second position up to the second-to-last position. It will remove the first and also the last element of the original array. After the result of the new array, it will contain all the elements from the second to the second last of the original array. Example Output: [ 'a', 'b', 'c', 'd', 'e', 'f' ] [ 'b', 'c', 'd', 'e', 'f' ] The slice method can take a single number as an argument, and in this case, it copies from that index to the end of the array. So, using arrayOfLetters.slice(1) will create a copy of the arrayOfLetters array that excludes the first element. Using Splice() methodIn JavaScript, with the help of this approach, we involve populating an array with a sequence of numbers and then removing the first and last elements if the array contains more than one element. The array is initially empty, and numbers from 0 to 9 are added to it. After ensuring the array has more than one element, the splice() method is used to remove the first element and then the last element. The resulting array excludes the original first and last elements. Example Let's take a simple example to show how we can remove the first element from an array in JavaScript. Output: [ 2, 3, 4, 5 ] Using shift() methodTo remove the first element from an array in JavaScript, we can use the Array.prototype.shift() method. With the help of this method, we remove the first element from the array and return the element. Example Output: [ 2, 3, 4, 5 ] 1 Using filter methodIn JavaScript, if you want to remove element with a certain value, we can use Array.prototype.filter(). Example In JavaScript, the filter takes a callback function and tests all the elements of the array with that callback. It keeps the element for which the callback returns true and removes the elements for which the callback returns false. In the above example, the callback checks letter != "a", so it returns false for the letter a and true for all the others, resulting in an array that doesn't include the letter a. ConclusionIn conclusion, removing the first and last elements from an array in JavaScript can be achieved using the slice() method or the splice() method, filter() method, etc. The slice() method creates a new array with a portion of the original array, excluding the first and last elements. The splice() method removes the first and last elements from the original array, if it contains more than one element. These methods provide flexibility and efficiency in data processing, filtering, and manipulation tasks. |
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