In Array How To Return Array Index

public static ltTgt int indexOfT arr, T val return Arrays.asListarr.indexOfval This creates a list wrapper for the input array using Arrays.asList and searches the index of the element with indexOf.

If array has more than one row and more than one column, and only row_num or column_num is used, INDEX returns an array of the entire row or column in array. row_num Required, unless column_num is present. Selects the row in array from which to return a value. If row_num is omitted, column_num is required.

The indexOf method returns the first index position of a specified value. The indexOf method returns -1 if the value is not found. The indexOf method starts at a specified index and searches from left to right from the given start postion to the end of the array. By default the search starts at the first element and ends at the last.

Element to locate in the array. fromIndex Optional. Zero-based index at which to start searching, converted to an integer. Negative index counts back from the end of the array if -array.length lt fromIndex lt 0, fromIndex array.length is used. Note, the array is still searched from front to back in this case.

The findIndex is an iterative method.It calls a provided callbackFn function once for each element in an array in ascending-index order, until callbackFn returns a truthy value. findIndex then returns the index of that element and stops iterating through the array. If callbackFn never returns a truthy value, findIndex returns -1.Read the iterative methods section for more information

To get INDEX to return an array of items to another function, you can use an obscure trick based on the IF and N functions. In the example shown, the formula in E5 is SUMINDEXdata,NIF1,1,2,3 where quotdataquot is the named range B5B10. In Excel 2021 and later, this trick is not necessary, thanks to dynamic arrays. See the TAKE function.

But to answer your question, INDEX can indeed be used to return an array. Or rather, two INDEX functions with a colon between them INDEXA1A4,2INDEXA1A4,3 This is because INDEX actually returns a cell reference OR a number, and Excel determines which of these you want depending on the context in which you are asking.

There is a find function to find an element in an array which returns an iterator to that element. If the element is not found, the iterator point to the end of array. In case the element is found, we can simply calculate the distance of the iterator from the beginning of the array to get the index of that element.

Time Complexity O1, since accessing array index require constant O1 time. Auxiliary Space O1, since no extra space has been used. Python In Python, indexing in arrays works by assigning a numerical value to each element in the array, starting from zero for the first element and increasing by one for each subsequent element.

Surprisingly, INDEX function does not returns an array of values when we supply an array as indexes. We only get the first value. And SUM function returns the sum of one value only. So how do we get INDEX function return that array. Well I found this solution on internet and I don't really understand how it works, but it works.