148 lines
6.8 KiB
JavaScript
148 lines
6.8 KiB
JavaScript
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var LazyWrapper = require('./_LazyWrapper'),
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LodashWrapper = require('./_LodashWrapper'),
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baseLodash = require('./_baseLodash'),
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isArray = require('./isArray'),
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isObjectLike = require('./isObjectLike'),
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wrapperClone = require('./_wrapperClone');
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* Creates a `lodash` object which wraps `value` to enable implicit method
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* chain sequences. Methods that operate on and return arrays, collections,
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* and functions can be chained together. Methods that retrieve a single value
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* or may return a primitive value will automatically end the chain sequence
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* and return the unwrapped value. Otherwise, the value must be unwrapped
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* with `_#value`.
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*
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* Explicit chain sequences, which must be unwrapped with `_#value`, may be
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* enabled using `_.chain`.
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*
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* The execution of chained methods is lazy, that is, it's deferred until
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* `_#value` is implicitly or explicitly called.
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*
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* Lazy evaluation allows several methods to support shortcut fusion.
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* Shortcut fusion is an optimization to merge iteratee calls; this avoids
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* the creation of intermediate arrays and can greatly reduce the number of
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* iteratee executions. Sections of a chain sequence qualify for shortcut
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* fusion if the section is applied to an array and iteratees accept only
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* one argument. The heuristic for whether a section qualifies for shortcut
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* fusion is subject to change.
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*
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* Chaining is supported in custom builds as long as the `_#value` method is
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* directly or indirectly included in the build.
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*
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* In addition to lodash methods, wrappers have `Array` and `String` methods.
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*
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* The wrapper `Array` methods are:
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* `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
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*
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* The wrapper `String` methods are:
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* `replace` and `split`
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*
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* The wrapper methods that support shortcut fusion are:
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* `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
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* `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
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* `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
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*
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* The chainable wrapper methods are:
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* `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
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* `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
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* `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
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* `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
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* `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
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* `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
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* `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
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* `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
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* `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
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* `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
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* `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
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* `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
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* `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
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* `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
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* `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
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* `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
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* `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
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* `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
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* `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
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* `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
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* `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
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* `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
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* `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
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* `zipObject`, `zipObjectDeep`, and `zipWith`
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*
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* The wrapper methods that are **not** chainable by default are:
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* `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
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* `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
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* `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
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* `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
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* `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
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* `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
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* `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
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* `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
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* `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
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* `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
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* `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
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* `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
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* `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
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* `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
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* `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
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* `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
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* `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
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* `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
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* `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
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* `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
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* `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
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* `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
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* `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
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* `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
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* `upperFirst`, `value`, and `words`
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*
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* @name _
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* @constructor
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* @category Seq
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* @param {*} value The value to wrap in a `lodash` instance.
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* @returns {Object} Returns the new `lodash` wrapper instance.
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* @example
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*
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* function square(n) {
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* return n * n;
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* }
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*
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* var wrapped = _([1, 2, 3]);
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*
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* // Returns an unwrapped value.
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* wrapped.reduce(_.add);
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* // => 6
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*
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* // Returns a wrapped value.
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* var squares = wrapped.map(square);
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*
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* _.isArray(squares);
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* // => false
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*
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* _.isArray(squares.value());
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* // => true
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*/
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function lodash(value) {
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if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
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if (value instanceof LodashWrapper) {
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return value;
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}
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if (hasOwnProperty.call(value, '__wrapped__')) {
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return wrapperClone(value);
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}
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}
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return new LodashWrapper(value);
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}
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// Ensure wrappers are instances of `baseLodash`.
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lodash.prototype = baseLodash.prototype;
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lodash.prototype.constructor = lodash;
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module.exports = lodash;
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