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"_rev": "11-7888810e3f80b9f1", "_id": "through2-filter", "readme": "through2-filter\n===============\n\n[![NPM](https://nodei.co/npm/through2-filter.png)](https://nodei.co/npm/through2-filter/)\n\nThis is a super thin wrapper around [through2](http://npm.im/through2) that works like `Array.prototype.filter` but for streams.\n\nFor when through2 is just too verbose :wink:\n\nNote you will **NOT** be able to alter the content of the chunks. This is intended for filtering only. If you want to modify the stream content, use either `through2` or `through2-map`.\n\n```js\nvar filter = require(\"through2-filter\")\n\nvar skip = filter(function (chunk) {\n // skip buffers longer than 100\n return chunk.length < 100\n})\n\n// vs. with through2:\nvar skip = through2(function (chunk, encoding, callback) {\n // skip buffers longer than 100\n if (chunk.length < 100) this.push(chunk)\n return callback()\n})\n\n// Then use your filter:\nsource.pipe(skip).pipe(sink)\n\n// Additionally accepts `wantStrings` argument to conver buffers into strings\nvar alphanum = new RegExp(\"^[A-Za-z0-1]+$\")\nvar scrub = filter({wantStrings: true}, function (str) {\n return alphanum.exec(str)\n})\n\n// Works like `Array.prototype.filter` meaning you can specify a function that\n// takes up to two* arguments: fn(element, index)\nvar skip10 = filter(function (element, index) {\n return index > 10\n})\n```\n\n*Differences from `Array.prototype.filter`:\n * No third `array` callback argument. That would require realizing the entire stream, which is generally counter-productive to stream operations.\n * `Array.prototype.filter` doesn't modify the source Array, which is somewhat nonsensical when applied to streams.\n\nAPI\n---\n\n`require(\"through2-filter\")([options], fn)`\n---\n\nCreate a `through2-filter` instance that will call `fn(chunk)`. If `fn(chunk)` returns \"true\" the chunk will be passed downstream. Otherwise it will be dropped.\n\n`require(\"through2-filter\").ctor([options], fn)`\n---\n\nCreate a `through2-filter` Type that can be instantiated via `new Type()` or `Type()` to create reusable spies.\n\n`require(\"through2-filter\").obj([options], fn)`\n---\n\nCreate a `through2-filter` that defaults to `objectMode = true`.\n\n`require(\"through2-filter\").objCtor([options], fn)`\n---\n\nCreate a `through2-filter` Type that defaults to `objectMode = true`.\n\nOptions\n-------\n\n * wantStrings: Automatically call chunk.toString() for the super lazy.\n * all other through2 options\n\nLICENSE\n=======\n\nMIT" }