Array

Solution To convert array to string in react js, use join() method for array of string, number and use JSON.stringify() for array of object. join() Method The join() method creates and returns a new string by concatenating all of the elements in an array (or an array-like object), separated by commas or a specified separator string. JSON.stringify() method The JSON.stringify() static method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified....

Solution To check empty array in react js, use array.length property and compare with 0 if length equal to zero it’s means array is empty. array.length The length property of an Array object represents the number of elements in that array. The value of the length property is a non-negative integer with a value less than 232. Snippet In this snippet, we will create an array and use the array.length property, compare with zero and to show the message if array is empty in UI....

Solution To declare const array in react js, use const keyword to define constant array, and import anyware you want to use. const The const declaration creates block-scoped constants, much like variables declared using the let keyword. The value of a constant can’t be changed through reassignment. Snippet In this snippet, we will create an array and as constant and console it in logs. const arr = ["aGuideHub", "SortoutCode", "ReactJsSnippet", "Infinitbility"]; console....

Solution To add an object to an array in react js, use the push() method it will add new objects at the end of array. You have to just pass your object into push method. push() Method The push() method adds one or more elements to the end of an array and returns the new length of the array. Snippet In this snippet, we will see short example to add object into an array using push() method....

Solution To update an array in the state in react js, each time you have to initiate a new array with previous array data then the array will update correctly and render component. To create a new array with previous data we will use an array with a spread operator. like this [...arr] Spread operator The Spread operator have lot’s of benfits but we are using Spread operator to assign previous array data in new array without their referance....

Solution To add multiple objects in array in react js, use the push() method with multiple object, it will add all new objects at the end of array. You have to just pass your object into push method. push() Method The push() method adds one or more elements to the end of an array and returns the new length of the array. Snippet In this snippet, we will see short example to add multiple objects into an array using push() method....

Solution To add multiple values in array in react js, use the push() method with multiple param, it will add new elements at the end of array. You have to just pass your value into push method. push() Method The push() method adds one or more elements to the end of an array and returns the new length of the array. Snippet In this snippet, we will see short example to add multiple items into an array using push() method....

Solution To add an array to an array in react js, use the push() method it will add new arrays at the end of array. You have to just pass your array into push method. push() Method The push() method adds one or more elements to the end of an array and returns the new length of the array. Snippet In this snippet, we will see short example to add array into an array using push() method....

Solution To add elements into an array in react js, use the push() method it will add new elements at the end of array. You have to just pass your value into push method. push() Method The push() method adds one or more elements to the end of an array and returns the new length of the array. Snippet In this snippet, we will see short example to add element into an array using push() method....

Solution To check string exists in an array in react js, use the includes() method for an array of string, or number and the findIndex() method for an array of objects. Snippet In this snippet, we will see the implementation of the includes() and findIndex() methods. Check string exists in an array of string, numbers, and boolean. const arr = ["aGuideHub", "SortoutCode", "Infinitbility"]; arr.includes('aGuideHub'); // true arr.includes('Hello'); // false Check string exists in an array of objects const arr = [ { id: 1, name: "aGuideHub" }, { id: 2, name: "SortoutCode" }, { id: 3, name: "Infinitbility" }, ] let index = arr....

Solution To get the index of an array element in react js, use the findIndex() method and pass your value it will search, and if the value match with any array element it will return the index of the element. findIndex() The findIndex() method returns the index of the first element in an array that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned....

Solution To get length of array in react js, use array.length property it will count and return number of element of array. array.length The length property of an Array object represents the number of elements in that array. The value of the length property is a non-negative integer with a value less than 232. Snippet In this snippet, we will create an array and use the array.length property to show the length of array....

Solution To remove first element from array in react js, use array.shift() method it will remove the first element of the array. shift() The shift() method removes the element at the zeroth index and shifts the values at consecutive indexes down, then returns the removed value. If the length property is 0, undefined is returned. Snippet In this snippet, we will create an array and use the shift() method method to remove the first element of array....

Solution To remove last element from array in react js, use array.pop() method it will remove the last element of the array. pop() The pop() method removes the last element from an array and returns that value to the caller. If you call pop() on an empty array, it returns undefined. Snippet In this snippet, we will create an array and use the pop() method method to remove the last element of array....

Solution To get the first element of the array in react js, use the array index method. In the array index method, we can access the first element of the array by just passing 0 in the array variable like this array[0]. Snippet In this snippet, we will create an array and use the array index method to get the first element. const arr = ["aguidehub", "infinitbility", "sortoutcode"]; const firstElement = arr[0]; console....

Solution To get the last element of the array in react js, use the array index method. In the array index method, we can access the last element of the array by just passing the array.length - 1in array variable like thisarray[array.length - 1]`. Snippet In this snippet, we will create an array and use the array index method to get the last element. const arr = ["aguidehub", "infinitbility", "sortoutcode"]; const lastElement = arr[arr....