add after ary assign assignIn assignInWith assignWith at before bind bindAll bindKey camelCase capitalize castArray ceil chain chunk clamp clone cloneDeep cloneDeepWith cloneWith compact concat conformsTo countBy create curry curryRight debounce deburr defaults defaultsDeep defer delay difference divide drop dropRight each eachRight endsWith entries entriesIn eq escape every extend extendWith fill filter find findIndex findKey findLast findLastIndex findLastKey first flatMap flatMapDeep flatMapDepth flatten flattenDeep flattenDepth flip floor forEach forEachRight forIn forInRight forOwn forOwnRight fromPairs functions functionsIn get groupBy gt gte has hasIn head inRange includes indexOf initial intersection invert invertBy invoke invokeMap isArguments isArray isArrayBuffer isArrayLike isArrayLikeObject isBoolean isBuffer isDate isElement isEmpty isEqual isEqualWith isError isFinite isFunction isInteger isLength isMap isMatch isMatchWith isNaN isNative isNil isNull isNumber isObject isObjectLike isPlainObject isRegExp isSafeInteger isSet isString isSymbol isTypedArray isUndefined isWeakMap isWeakSet join kebabCase keyBy keys keysIn last lastIndexOf lowerCase lowerFirst lt lte map mapKeys mapValues max maxBy mean meanBy memoize merge mergeWith min minBy multiply negate nth omit omitBy once orderBy overArgs pad padEnd padStart parseInt partial partialRight partition pick pickBy pull pullAll pullAllBy pullAllWith pullAt random rearg reduce reduceRight reject remove repeat replace rest result reverse round sample sampleSize set setWith shuffle size slice snakeCase some sortBy sortedIndex sortedIndexOf sortedLastIndex sortedLastIndexOf sortedUniq split spread startCase startsWith subtract sum sumBy tail take takeRight tap template throttle thru toArray toFinite toInteger toLength toLower toNumber toPairs toPairsIn toPlainObject toSafeInteger toString toUpper transform trim trimEnd trimStart truncate unary unescape union uniq uniqBy uniqWith unset unzip unzipWith update updateWith upperCase upperFirst values valuesIn without words wrap wrapperAt wrapperChain wrapperCommit wrapperFlatMap wrapperLodash wrapperNext wrapperPlant wrapperReverse wrapperToIterator wrapperValue xor zip zipObject zipObjectDeep zipWith

Lodash _.findLastIndex


The lodash _.findLastIndex method is a JavaScript function that is used to iterate over an array and return the index of the last element that matches a given condition. This method is useful when searching for elements in an array based on a certain criteria.

The syntax of the _.findLastIndex method is:

_.findLastIndex(array, [predicate=_.identity], [fromIndex=array.length-1])

Where array is the array to be searched, predicate is the function that determines the search condition, and fromIndex is the optional starting index for the search.

The predicate function can be specified in two ways:

  • As a function that returns a boolean value based on the given element.
  • As an object where the property values are used for the search condition.

If the predicate function returns true for an element of the array, the index of that element is returned. If no element matches the condition specified in the predicate function, -1 is returned.

If the fromIndex parameter is specified, the search will start from that index and move towards the beginning of the array. Otherwise, the search will start from the end of the array.

The _.findLastIndex method can be used with arrays of any type or objects with enumerable properties. It is a powerful tool that can simplify searching and filtering operations on arrays.

Overall, the _.findLastIndex method is a valuable function in the lodash library that is useful for searching arrays and objects based on specific criteria. Its simplicity and versatility make it an essential tool for any JavaScript developer.