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 _.sortedLastIndexOf


The _.sortedLastIndexOf method in lodash is a convenient utility function that helps to find the index of the last occurrence of a given value in a sorted array. This method is especially useful when working with sorted arrays, as it provides an efficient way to determine the position of an element in the array without the need for a linear search.

The function takes two arguments. The first argument is the array to be searched, and the second argument is the value to search for. The method returns the index of the last occurrence of the given value, or -1 if the value is not found in the array.

Here is the syntax for using the _.sortedLastIndexOf method:

_.sortedLastIndexOf(array, value)
  • array: Required. The sorted array to search.
  • value: Required. The value to search for.

The _.sortedLastIndexOf method uses a binary search algorithm to find the position of the given value in the array. This algorithm is more efficient than a linear search when working with sorted arrays, as it eliminates half the remaining elements in each iteration.

It is important to note that the _.sortedLastIndexOf method assumes that the input array is sorted in ascending order. If the array is not sorted, the method may produce incorrect results. In addition, the method only works with primitive values and does not work with objects or arrays.

In summary, the _.sortedLastIndexOf method is a useful utility function in lodash for finding the index of the last occurrence of a given value in a sorted array. It is an efficient algorithm for working with sorted arrays and can help to improve performance in your code. However, it is important to ensure that the input array is sorted and to use primitive values when calling this method.