JavaScript Array isArray() method is used to determine whether a given value is an array. It returns a boolean value: true if the value is an array, and false otherwise. This method is particularly useful when working with dynamic data structures or verifying input types in your code. Pre-requisites to Learn Syntax Parameters Parameter Description…
JavaScript Array forEach() method iterates over each element in an array and execute a provided callback function once for each element. Unlike some other array methods, forEach() does not return a new array or value—it is used solely for performing operations on each array element. Pre-requisites to Learn Syntax Parameters Parameter Description callback (Required) A…
JavaScript Array includes() method determines whether an array contains a specific value or not. It returns a boolean value (true or false) based on whether the specified value exists in the array. Pre-requisites to Learn Syntax Parameters Parameter Description valueToFind (Required) The value to search for in the array. fromIndex (Optional) The index to start…
JavaScript Array keys() method returns a new Array Iterator object containing the keys (or indices) of the elements in the array. It is particularly useful for iterating over an array’s indices. Pre-requisites to Learn Syntax Parameters The Array.keys() method does not accept any parameters. Return Value The keys() method returns a new Array Iterator object…
JavaScript Array lastIndexOf() method is used to search for the last occurrence of a specified element in an array. It returns the index of the element if found, or -1 if the element does not exist in the array. The search is performed in reverse order, starting from the end of the array. Pre-requisites to…
JavaScript Array map() method creates a new array by applying a callback function to each element of the original array. It is an essential tool for transforming data in functional programming and is commonly used for manipulating arrays in a concise and readable way. Pre-requisites to Learn Syntax Parameters Parameter Description callback (Required) A function…