Write a JavaScript program to shuffle an array. Write a JavaScript program to find the leap years in a given range of years. Note : Use ordinal numbers to tell their position.ġ6. Write a JavaScript program to display the colors in the following way : We have the following arrays : Go to the editorĬolor = Write a JavaScript program to remove duplicate items from an array (ignore case sensitivity). Write a JavaScript program to add items in an blank array and display the items. Write a JavaScript program to compute the sum and product of an array of integers. Write a JavaScript program to find the sum of squares of a numeric vector. Write a JavaScript program which prints the elements of the following array. For example if you input 'The Quick Brown Fox' the output should be 'tHE qUICK bROWN fOX'. Write a JavaScript program which accept a string as input and swap the case of each character. Write a JavaScript program to find the most frequent item of an array. Write a JavaScript program to sort the items of an array. For example if you accept 025468 the output should be 0-254-6-8. Write a JavaScript program which accept a number as input and insert dashes (-) between each two even numbers. Write a simple JavaScript program to join all elements of the following array into a string. Passing a parameter 'n' will return the last 'n' elements of the array. Write a JavaScript function to get the last element of an array. Passing a parameter 'n' will return the first 'n' elements of the array. Write a JavaScript function to get the first element of an array. Go to the editorĬonsole.log(array_Clone(])) ģ. Write a JavaScript function to clone an array. Write a JavaScript function to check whether an `input` is an array or not.
Array javascript free#
Sign up for our free weekly newsletter here. We can compute various kinds of differences between arrays with sets and array methods. Returned by the callback to get all the elements that are only in arr1 or only in arr2. Then we convert the set back to an array with the outer spread operator.Īnd then we call filter on that with: (!arr1.includes(x) & arr2.includes(x)) || (arr1.includes(x) & !arr2.includes(x)) This will remove any duplicate elements from the combined arrays. We put all the array items into a set by passing an array with both the entries from arr1 and arr2 in it into the Set constructor. To compute the symmetric difference, we can write: const arr1 = const arr2 = const symDiff = )].filter(x => (!arr1.includes(x) & arr2.includes(x)) || (arr1.includes(x) & !arr2.includes(x))) console.log(symDiff) The symmetric difference between 2 arrays is the set of items that are in either array but not both. If they aren’t then we include it in the intersection array. The difference between 2 arrays is an array of all the items that are available in one array but not the other.įor instance, if we have arr1 and arr2 like we have above, we can get all the items from arr2 that isn’t in arr1 by writing: const arr1 = const arr2 = const intersection = arr2.filter(x => !arr1.includes(x)) console.log(intersection)Īll we did is change the filter callback to check whether item x in arr2 is included in arr1 or not. We can switch arr1 and arr2 in the 3rd line and get the same result.įor instance, we can write: const arr1 = const arr2 = const intersection = arr2.filter(x => arr1.includes(x)) console.log(intersection) We can write: const arr1 = const arr2 = const intersection = arr1.filter(x => arr2.includes(x)) console.log(intersection)Īnd we compute the intersection by calling filter on arr1 with a callback that checks whether the item x from arr1 is also included with arr2. To get the intersection, we can use the filter method. The intersection between 2 arrays is a set of items that are in both arrays.
Array javascript how to#
In this article, we’ll look at how to get various kinds of differences between 2 arrays in JavaScript. The difference is the item in one array that’s not in the other.
Sometimes we need to get the difference between 2 JavaScript arrays.