you have an array and you need to remove a specific item, how would you
in Java, sorry You can’t do that. It is strongly typed.
in fact, from
creation time you would specify what type of data is coming in and its
you can’t do otherwise once you have stated the type of data and
length. any attempts to do otherwise to what you stated leads to
Also, the length of an array is dynamically sized and can keep growing. In other words, you don’t need to specify the array size upfront. You can access the values by referring to an index number. The index number starts from zero as you can see from the image below. The first item in the array is index 0, the second item, index 1. the third item, index 2. E. t. c.
The students’ array is empty hence why it holds no element.
you know the number of elements that the array will hold, you can
create an array with an initial size as shown in the following example:
To create an array with some elements, you pass the elements as a comma-separated list into the Array() constructor.
For example, the following creates the students’ array that has five elements (or numbers):
important to notice that if you use the array constructor to create an
array and pass it into a number, you are creating an array with an
However, when you pass a value of another type like string into the Array() constructor, you create an array with an element of that value. For example:
You can as well create an empty array for later use by doing the following:
any time. You don’t just have to start writing them. All you need is to
call the method needed for the task you are doing.
The methods are:
- The join() method also joins all array elements into a string.
- The pop() method returns the value that was “popped out”
- The push() method adds a new element to an array (at the end). When you work with arrays, it is easy to remove elements and add new elements.
- The indexOf() method finds the index of an element.
- The Array.isArray() method checks if a value is an array, it returns true if the value you are looking for is present, otherwise returns false.
- The shift() method removes the first array element and “shifts” all other elements to a lower index and returns the value that was “shifted out”.
- The unshift() method adds a new element to an array (at the beginning), and “unshifts” older elements, and returns the new array length.
- The splice() method can be used to add new items to an array, specifying what index you want to add the new items to.
- The concat() method creates a new array by merging (concatenating) existing arrays,
Note that The concat() method does not change the existing arrays. It
always returns a new array. The concat() method can take any number of
1. Pop method
2. Shift method
3. Splice method
Starting at index position 0, it removes two elements [“candy”, “crush”] and retains [“cookies”, “oat”].
What if you have more than one element of the same value which you would love to remove, here is how to go about it:
[1, 2, 3, 4, 6, 7, 8, 9, 0]//Output
We have seen three ways to remove items from an array like the pop method which removes the last element of a given array or shift method which removes the first element of the given array, or the splice which can remove a set of elements from an array.
learn more, you should join a good
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