관리-도구

편집 파일: lodash.js

var LazyWrapper = require('../internal/LazyWrapper'), LodashWrapper = require('../internal/LodashWrapper'), baseLodash = require('../internal/baseLodash'), isArray = require('../lang/isArray'), isObjectLike = require('../internal/isObjectLike'), wrapperClone = require('../internal/wrapperClone'); /** Used for native method references. */ var objectProto = Object.prototype; /** Used to check objects for own properties. */ var hasOwnProperty = objectProto.hasOwnProperty; /** * Creates a `lodash` object which wraps `value` to enable implicit chaining. * Methods that operate on and return arrays, collections, and functions can * be chained together. Methods that retrieve a single value or may return a * primitive value will automatically end the chain returning the unwrapped * value. Explicit chaining may be enabled using `_.chain`. The execution of * chained methods is lazy, that is, execution is deferred until `_#value` * is implicitly or explicitly called. * * Lazy evaluation allows several methods to support shortcut fusion. Shortcut * fusion is an optimization strategy which merge iteratee calls; this can help * to avoid the creation of intermediate data structures and greatly reduce the * number of iteratee executions. * * Chaining is supported in custom builds as long as the `_#value` method is * directly or indirectly included in the build. * * In addition to lodash methods, wrappers have `Array` and `String` methods. * * The wrapper `Array` methods are: * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, * `splice`, and `unshift` * * The wrapper `String` methods are: * `replace` and `split` * * The wrapper methods that support shortcut fusion are: * `compact`, `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`, * `first`, `initial`, `last`, `map`, `pluck`, `reject`, `rest`, `reverse`, * `slice`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, `toArray`, * and `where` * * The chainable wrapper methods are: * `after`, `ary`, `assign`, `at`, `before`, `bind`, `bindAll`, `bindKey`, * `callback`, `chain`, `chunk`, `commit`, `compact`, `concat`, `constant`, * `countBy`, `create`, `curry`, `debounce`, `defaults`, `defaultsDeep`, * `defer`, `delay`, `difference`, `drop`, `dropRight`, `dropRightWhile`, * `dropWhile`, `fill`, `filter`, `flatten`, `flattenDeep`, `flow`, `flowRight`, * `forEach`, `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`, * `functions`, `groupBy`, `indexBy`, `initial`, `intersection`, `invert`, * `invoke`, `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, * `matchesProperty`, `memoize`, `merge`, `method`, `methodOf`, `mixin`, * `modArgs`, `negate`, `omit`, `once`, `pairs`, `partial`, `partialRight`, * `partition`, `pick`, `plant`, `pluck`, `property`, `propertyOf`, `pull`, * `pullAt`, `push`, `range`, `rearg`, `reject`, `remove`, `rest`, `restParam`, * `reverse`, `set`, `shuffle`, `slice`, `sort`, `sortBy`, `sortByAll`, * `sortByOrder`, `splice`, `spread`, `take`, `takeRight`, `takeRightWhile`, * `takeWhile`, `tap`, `throttle`, `thru`, `times`, `toArray`, `toPlainObject`, * `transform`, `union`, `uniq`, `unshift`, `unzip`, `unzipWith`, `values`, * `valuesIn`, `where`, `without`, `wrap`, `xor`, `zip`, `zipObject`, `zipWith` * * The wrapper methods that are **not** chainable by default are: * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clone`, `cloneDeep`, * `deburr`, `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`, * `floor`, `get`, `gt`, `gte`, `has`, `identity`, `includes`, `indexOf`, * `inRange`, `isArguments`, `isArray`, `isBoolean`, `isDate`, `isElement`, * `isEmpty`, `isEqual`, `isError`, `isFinite` `isFunction`, `isMatch`, * `isNative`, `isNaN`, `isNull`, `isNumber`, `isObject`, `isPlainObject`, * `isRegExp`, `isString`, `isUndefined`, `isTypedArray`, `join`, `kebabCase`, * `last`, `lastIndexOf`, `lt`, `lte`, `max`, `min`, `noConflict`, `noop`, * `now`, `pad`, `padLeft`, `padRight`, `parseInt`, `pop`, `random`, `reduce`, * `reduceRight`, `repeat`, `result`, `round`, `runInContext`, `shift`, `size`, * `snakeCase`, `some`, `sortedIndex`, `sortedLastIndex`, `startCase`, * `startsWith`, `sum`, `template`, `trim`, `trimLeft`, `trimRight`, `trunc`, * `unescape`, `uniqueId`, `value`, and `words` * * The wrapper method `sample` will return a wrapped value when `n` is provided, * otherwise an unwrapped value is returned. * * @name _ * @constructor * @category Chain * @param {*} value The value to wrap in a `lodash` instance. * @returns {Object} Returns the new `lodash` wrapper instance. * @example * * var wrapped = _([1, 2, 3]); * * // returns an unwrapped value * wrapped.reduce(function(total, n) { * return total + n; * }); * // => 6 * * // returns a wrapped value * var squares = wrapped.map(function(n) { * return n * n; * }); * * _.isArray(squares); * // => false * * _.isArray(squares.value()); * // => true */ function lodash(value) { if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) { if (value instanceof LodashWrapper) { return value; } if (hasOwnProperty.call(value, '__chain__') && hasOwnProperty.call(value, '__wrapped__')) { return wrapperClone(value); } } return new LodashWrapper(value); } // Ensure wrappers are instances of `baseLodash`. lodash.prototype = baseLodash.prototype; module.exports = lodash;