JavaScript typedArray.findIndex() with Example Last Updated : 22 Dec, 2022 Comments Improve Suggest changes Like Article Like Report The Javascript typedArray.findIndex() is an inbuilt function in JavaScript that is used to return an index in the tyedArray if the value satisfies the condition given in the function, otherwise, it returns -1. Syntax: typedarray.findIndex(callback) Parameters: It takes the parameter “callback” function which checks each element of the typedArray satisfied by the condition provided. The Callback function takes three parameters that are specified below- element: It is the value of the element.index: It is the index of the element.array: It is the array that is being traversed. Return value: It returns an index in the array if the elements satisfied the condition provided by the function, otherwise, it returns -1. JavaScript example to show the working of this function: Example: This example shows the basic use of the typedArray.findIndex() method in Javascript. javascript <script> // Calling isNegative function to check // elements of the typedArray function isNegative(element, index, array) { return element < 0; } // Created some typedArrays. const A = new Int8Array([ -10, 20, -30, 40, -50 ]); const B = new Int8Array([ 10, 20, -30, 40, -50 ]); const C = new Int8Array([ -10, 20, -30, 40, 50 ]); const D = new Int8Array([ 10, 20, 30, 40, 50 ]); // Calling findIndex() function to check condition // provided by its parameter const a = A.findIndex(isNegative); const b = B.findIndex(isNegative); const c = C.findIndex(isNegative); const d = D.findIndex(isNegative); // Printing the indexes typedArray console.log(a); console.log(b); console.log(c); console.log(d); </script> Output: 0 2 0 -1 Comment More infoAdvertise with us Next Article JavaScript typedArray.findIndex() with Example S ShivamKD Follow Improve Article Tags : JavaScript Web Technologies javascript-functions javascript-typedArray Similar Reads JavaScript typedArray.find() with Example The Javascript typedArray.find() is an inbuilt function in JavaScript that is used to return a value in the typedArray, if the value satisfies the condition given in the function, otherwise, it returns undefined. 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If no element meets the condition, it returns -1.Syntaxarray.findIndex(callbackFn(value, index, array): boolean): numberParameterscallbackFn: A function that is 2 min read JavaScript typedArray.keys() Method The typedArray.keys() is an inbuilt function in JavaScript which is used to return a new array iterator containing the keys for each index of the elements of the given typedArray. Syntax: typedArray.keys() Parameter: This function does not accept anything as parameter. Return value: It returns a new 1 min read Like