This method is used to find out whether the element is included in the array or not. It is returning 1 as the string found in the array.Ĭode example 2: Using Array.findIndex() and toUpperCase() functions const subjects = Ĭonst result = subjects.findIndex(item => sub.toUpperCase() = item.toUpperCase()) Ĭonsole.log("String exists in the array") Ĭonsole. The () method was introduced in ECMAScript 6. Some final notes on the include() function: it takes a second optional argument, as the index from there to start the search. Using shows.findIndex() and lowercase() function we are ignoring the case and find the string in the array and assigning the returned value to the result variable. Notes on the Javascript include() function. In the above code example, we have created an array named shows that contain multiple items. The JavaScript includes () method determines whether a list includes a specified item. Use Array.findIndex() function and inside this function convert the string to lowercase along with the converting array item to lowercase.Ĭode example 1: Using Array.findIndex() and String.toLowerCase() functions const shows = Ĭonst result = shows.findIndex( item => show.toLowerCase() = item.toLowerCase()).Create an array that contains multiple string items.
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