lodash 4.2.1 发布，JavaScript 实用工具库

lodash 4.2.1 发布，该版本没有改进记录，但 4.2.0 的改进记录包括：

• Added fp/assoc & fp/assocPath as aliases of fp/set

• Added fp/dissoc & fp/dissocPath as aliases of fp/unset

• Added start param to _.spread

• Ensured _.attempt preserves custom errors

• Ensured fp/partial & fp/partialRight accept an args param

• Ensured fp/unset is immutable

• Ensured _.iteratee clones sources for “_.matchesProperty” shorthand

• Made _.flatMap a “Collection” method

• Removed global references from the npm package

lodash 是一个 JavaScript 实用工具库，提供一致性，模块化，性能和配件等功能。