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How to use JavaScript array methods, and what are the most common array methods for JavaScript? Learn array methods with example.
The JavaScript includes() method determines whether an array includes a certain value, If array contains it returns true and if doesn't it will return false.
The JavaScript array concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.
The JavaScript sort method sorts the elements of an array and returns the sorted array. The default sort order is ascending, but you can also sort array in descending order.
The main difference between JavaScript indexOf and findIndex methods are functions parameters. IndexOf expects a value as first parameter while findIndex expects a callback as first parameter.
JavaScript findIndex() method is used to return index of first matching element from an array, will return -1 if no match was found.
JavaScript indexOf method is used to return index of first matching element from an array, will return -1 if no match was found.
The JavaScript find, filter and some methods are similar and very different. Let's see few examples to learn the difference and usage between them.
JavaScript array find method searches an array and returns the first matching element found, or it will return undefined if no match is found.
JavaScript array every method checks if every element in your array passes your test. If every element passes it returns true, if not returns false.
Javascript array some method check all elements in array, if at least one element passes the condition it will return true otherwise the result is false.
JavaScript array reduce is commonly used for performing math expressions and equations, for instance calculating the total of a numbers array.
JavaScript array filter method conditionally return elements from one array into a new array. It's used to remove items by excluding them from the result.
JavaScript array map method allows us to loop thru an array, access each value in each iteration and return changed or copied values in form of a new array.
Array ForEach is a method that exists on the Array.prototype that was introduced in ECMAScript and is supported in all modern browsers.
Reserved keywords in ECMAscript also known as JavaScript which are listed below. These keywords cannot be used as variable or function names in JavaScript.
Variables in JavaScript is to store data that can be changed later. All JavaScript apps need to work with data, data is always stored in variables.