JavaScript Arrays W3Schools
The solution is an array An array can hold many values under a single name and you can access the values by referring to an index number Creating an Array Using an array literal is the easiest way to create a JavaScript Array Syntax const array name item1 item2 It is a common practice to declare arrays with the const keyword
Array prototype find JavaScript MDN MDN Web Docs, The find method of Array instances returns the first element in the provided array that satisfies the provided testing function If no values satisfy the testing function undefined is returned If you need the index of the found element in the array use findIndex If you need to find the index of a value use indexOf
Array JavaScript MDN MDN Web Docs
JavaScript arrays are zero indexed the first element of an array is at index 0 the second is at index 1 and so on and the last element is at the value of the array s length property minus 1 JavaScript array copy operations create shallow copies
JavaScript Array find Method W3Schools, Description The find method returns the value of the first element that passes a test The find method executes a function for each array element The find method returns undefined if no elements are found The find method does not execute the function for empty elements The find method does not change the original array Syntax
Array prototype indexOf JavaScript MDN MDN Web Docs
Array prototype indexOf JavaScript MDN MDN Web Docs, Description The indexOf method compares searchElement to elements of the array using strict equality the same algorithm used by the operator NaN values are never compared as equal so indexOf always returns 1 when searchElement is NaN The indexOf method skips empty slots in sparse arrays The indexOf method is generic
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Array prototype findLast JavaScript MDN MDN Web Docs
Array prototype findLast JavaScript MDN MDN Web Docs The findLast method of Array instances iterates the array in reverse order and returns the value of the first element that satisfies the provided testing function If no elements satisfy the testing function undefined is returned If you need to find the first element that matches use find the index of the last matching element in the array use findLastIndex
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Returns the first index of an array element that passes a test forEach calls a function for each element includes checks if an array contains a specified element push aads a new element to the end of an array and returns the new length of an array unshift adds a new element to the beginning of an array and returns the new length of JavaScript Arrays with Examples Programiz. Syntax js every callbackFn every callbackFn thisArg Parameters callbackFn A function to execute for each element in the array It should return a truthy value to indicate the element passes the test and a falsy value otherwise The function is called with the following arguments element The current element being processed in the array index If no item in the array meets the condition an empty array is returned You can read more about this method here There are times when we don t need all the elements that meet a certain condition We just need one element that matches the condition In that case you need the find method Array find
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