Basically, multi-dimension arrays are used if you want to put arrays inside an array. Let's take an example. Say you wanted to store every 6 hour's temperature for every weekday. You could do something like −let monday = [35, 28, 29, 31]; let tuesday = [33, 24, 25, 29]; //...This is a good place to use a multidimensional array instead. A multidimensional array is nothing but an array of arrays. If we take forward our example, each row will represent a day while each entry in the row will represent a temp entry. For example, let temps = [   ... Read More

Javascript provides a collection of functions that you can use to find elements in an array. Let's start with the most basic one. The indexOf function goes through the entire array and returns the index of the element you searched for, if it is found else it returns -1. For example, Examplelet people = ["Harry", "Martha", "John", "Sam"]; console.log(people.indexOf("John")) console.log(people.indexOf("Jim"))OutputThis will give the output −2 -1There are other, more complex functions that you can use to make search more powerful. Let's look at find() method. The find() method returns the first object matching the condition you provide it as the ... Read More

There are two ways to join 2 arrays in Javascript. If you want to get a new array and not want to disturb the existing arrays while joining the two arrays then you should use the concat method as follows − Examplelet arr1 = [1, 2, 3, 4]; let arr2 = [5, 6, 7, 8]; let arr3 = arr1.concat(arr2); console.log(arr1); console.log(arr2); console.log(arr3);OutputThis will give the output −[1, 2, 3, 4] [5, 6, 7, 8] [1, 2, 3, 4, 5, 6, 7, 8]Note that the existing arrays were not modified. If you want to join in place, you'll need to use the ... Read More

In this article, we are going to discuss removing an element from a given position of the array in JavaScript. The delete operator, the slice() method, and the splice() method can be used to remove an element from a given position of the array in this article. Following is the syntax of the delete operator. let del = delete arr[index]; Following is the syntax of the slice() method. arr.slice(start, end) Following is the syntax of the splice() method. arr.splice(position, no_of_elem) Using delete Operator Example In this example, we are going to discuss the use of the ... Read More

In this article, we are going to discuss removing an element from the start of the array in JavaScript. For that, we are going to use the _.rest() method. This method returns the array elements except for the 0th indexed element. We can also use the shift() method and the slice() method to remove the first element from an array. Let us see the implementation of it further. Using _.rest() Method The following example demonstrates how to remove the start element from an array in JavaScript. Syntax The syntax of the _.rest() method is − _.rest( array, index ); ... Read More

In this article, we are going to discuss how to remove an element from the end of the array in JavaScript. An array is a special variable, which can hold more than one value. An array is a collection of items stored at contiguous memory locations. The idea is to store multiple items together. This makes it easier to calculate the position of each element by simply adding an offset to a base value of the memory location of the first element of the array. The base value is index 0 for the first element in the array and the ... Read More

In this article, we are going to learn how to add an element at the start of the array in JavaScript. An array is a special variable, which can hold more than one value sequentially. It is a collection of items stored at contiguous memory locations. The idea is to store multiple items together. This makes it easier to calculate the position of each element by simply adding an offset to a base value of the memory location of the first element of the array. The base value is index 0 for the first element in the array and the ... Read More

In this article, we are going to add an at the end of the array in JavaScript. An array is a special variable, which can hold more than one value. An array is a collection of items stored at contiguous memory locations. The idea is to store multiple items together. This makes it easier to calculate the position of each element by simply adding an offset to a base value of the memory location of the first element of the array. The base value is index 0 for the first element in the array and the difference between the two ... Read More

There are many ways to create an Array in JavaScript. We'll look at how to create an empty array first using 2 methods.let myArr = []; let myArr = new Array();Both of the above lines create an empty array. The JavaScript community always prefers the first method as it is easier to read, type and performs the same task as the second one. You can also populate the array when you're creating it using either of the following 2 notations −let myArr = ["Mon", "Tue", "Wed", "Thu", "Fri"]; let myArr = new Array("Mon", "Tue", "Wed", "Thu", "Fri");You can print it ... Read More

The array is a container which can hold a fixed number of items and these items should be of the same type. It stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.Why do we need arrays?Let's say you want to record the average temperatures of all days of the week. You can record them as follows −let avgTempMon = 35; let avgTempTue = 33; let avgTempWed = 31; ... Read More