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 _.flatten

Overview

The lodash _.flatten method is a utility function that takes an array and flattens it into a single-dimensional array. It does this by recursively iterating through the array and concatenating any sub-arrays it encounters.

The method has a single parameter, which is the array to be flattened. It returns a new array containing all the elements of the original array, but with any sub-arrays flattened. The original array is not modified.

The _.flatten method can be used with arrays of any depth, meaning that it can flatten arrays that contain both nested arrays and objects. It also supports the option to flatten only the first level of nested arrays, by passing a depth argument.

Here is an example of how to use the _.flatten method:

const nestedArray = [1, [2, [3, [4]], 5]];

const flattenedArray = _.flatten(nestedArray);

console.log(flattenedArray);
// Output: [1, 2, 3, 4, 5]

In this example, the nestedArray contains both sub-arrays and sub-objects. The _.flatten method is used to create a flattened array flattenedArray that contains all the elements of the original array, but with any sub-arrays flattened.

Overall, the _.flatten method is a useful utility function for working with nested arrays and objects, allowing developers to easily flatten complex data structures into a more simple and manageable format.