requirebin sketch

index.js

var Writable = require('readable-stream/writable'),
    Readable = require('readable-stream/readable'),
    QueryStream = require('querystream');

// Some sample data
var sampleData = [
    { x : 10, y : 200 },
    { x : 20, y : 190 },
    { x : 30, y : 180 },
    { x : 40, y : 170 },
    { x : 50, y : 160 },
    { x : 60, y : 150 },
    { x : 70, y : 140 },
    { x : 80, y : 130 },
    { x : 90, y : 120 },
    { x : 100, y : 110 }
];

// Create a readable stream that provides the sample data
var inputStream = new Readable({ objectMode : true });
inputStream._read = function (size) {
    sampleData.forEach(function(data) {
        inputStream.push(data);
    });
    inputStream.push(null);
};

// Create a writable stream that prints the data to the console
var outputStream = new Writable({ objectMode : true });
outputStream._write = function (chunk, encoding, next) {
    console.log(chunk);
    next();
};

// Create a new QueryStream that only emits data with 
// an `x` property greater than 50
var greater50Stream = new QueryStream({
    x : { $gt : 50 }
});

// Pipe it all together
inputStream
    .pipe(greater50Stream)
    .pipe(outputStream);

minified.js

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t=[],e=this.length,n=0;e>n;n++)if(t[n]=i(this.parent[n+this.offset]),n==r.INSPECT_MAX_BYTES){t[n+1]="...";break}return"<Buffer "+t.join(" ")+">"},l.prototype.get=function(t){if(0>t||t>=this.length)throw Error("oob");return this.parent[this.offset+t]},l.prototype.set=function(t,e){if(0>t||t>=this.length)throw Error("oob");
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t=[],e=this.length,n=0;e>n;n++)if(t[n]=i(this.parent[n+this.offset]),n==r.INSPECT_MAX_BYTES){t[n+1]="...";break}return"<Buffer "+t.join(" ")+">"},l.prototype.get=function(t){if(0>t||t>=this.length)throw Error("oob");return this.parent[this.offset+t]},l.prototype.set=function(t,e){if(0>t||t>=this.length)throw Error("oob");return this.parent[this.offset+t]=e},l.prototype.write=function(t,e,r,i){if(isFinite(e))isFinite(r)||(i=r,r=void 0);else{var o=i;i=e,e=r,r=o}e=+e||0;var s=this.length-e;r?(r=+r,r>s&&(r=s)):r=s,i=((i||"utf8")+"").toLowerCase();var a;switch(i){case"hex":a=this.parent.hexWrite(t,this.offset+e,r);break;case"utf8":case"utf-8":a=this.parent.utf8Write(t,this.offset+e,r);break;case"ascii":a=this.parent.asciiWrite(t,this.offset+e,r);break;case"binary":a=this.parent.binaryWrite(t,this.offset+e,r);break;case"base64":a=this.parent.base64Write(t,this.offset+e,r);break;case"ucs2":case"ucs-2":a=this.parent.ucs2Write(t,this.offset+e,r);break;default:throw Error("Unknown 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p(this,t,!0,e)},e.prototype.readInt8=function(t,e){var r,n=this;return e||(x.ok(void 0!==t&&null!==t,"missing offset"),x.ok(n.length>t,"Trying to read beyond buffer length")),t>=n.length?void 0:(r=128&n[t],r?-1*(255-n[t]+1):n[t])},e.prototype.readInt16LE=function(t,e){return d(this,t,!1,e)},e.prototype.readInt16BE=function(t,e){return d(this,t,!0,e)},e.prototype.readInt32LE=function(t,e){return g(this,t,!1,e)},e.prototype.readInt32BE=function(t,e){return g(this,t,!0,e)},e.prototype.readFloatLE=function(t,e){return y(this,t,!1,e)},e.prototype.readFloatBE=function(t,e){return y(this,t,!0,e)},e.prototype.readDoubleLE=function(t,e){return v(this,t,!1,e)},e.prototype.readDoubleBE=function(t,e){return v(this,t,!0,e)},e.prototype.writeUInt8=function(t,e,r){var n=this;r||(x.ok(void 0!==t&&null!==t,"missing value"),x.ok(void 0!==e&&null!==e,"missing offset"),x.ok(n.length>e,"trying to write beyond buffer length"),b(t,255)),n.length>e&&(n[e]=t)},e.prototype.writeUInt16LE=function(t,e,r){w(this,t,e,!1,r)},e.prototype.writeUInt16BE=function(t,e,r){w(this,t,e,!0,r)},e.prototype.writeUInt32LE=function(t,e,r){m(this,t,e,!1,r)},e.prototype.writeUInt32BE=function(t,e,r){m(this,t,e,!0,r)},e.prototype.writeInt8=function(t,e,r){var n=this;r||(x.ok(void 0!==t&&null!==t,"missing value"),x.ok(void 0!==e&&null!==e,"missing offset"),x.ok(n.length>e,"Trying to write beyond buffer 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Length must be a multiple of 4";for(s=t.indexOf("="),s=s>0?t.length-s:0,a=[],i=s>0?t.length-4:t.length,e=0,r=0;i>e;e+=4,r+=3)o=n.indexOf(t[e])<<18|n.indexOf(t[e+1])<<12|n.indexOf(t[e+2])<<6|n.indexOf(t[e+3]),a.push((16711680&o)>>16),a.push((65280&o)>>8),a.push(255&o);return 2===s?(o=n.indexOf(t[e])<<2|n.indexOf(t[e+1])>>4,a.push(255&o)):1===s&&(o=n.indexOf(t[e])<<10|n.indexOf(t[e+1])<<4|n.indexOf(t[e+2])>>2,a.push(255&o>>8),a.push(255&o)),a}function r(t){function e(t){return n[63&t>>18]+n[63&t>>12]+n[63&t>>6]+n[63&t]}var r,i,o,s=t.length%3,a="";for(r=0,o=t.length-s;o>r;r+=3)i=(t[r]<<16)+(t[r+1]<<8)+t[r+2],a+=e(i);switch(s){case 1:i=t[t.length-1],a+=n[i>>2],a+=n[63&i<<4],a+="==";break;case 2:i=(t[t.length-2]<<8)+t[t.length-1],a+=n[i>>10],a+=n[63&i>>4],a+=n[63&i<<2],a+="="}return a}var n="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";e.exports.toByteArray=t,e.exports.fromByteArray=r})()},{}]},{},[]);var Writable=require("readable-stream/writable"),Readable=require("readable-stream/readable"),QueryStream=require("querystream"),sampleData=[{x:10,y:200},{x:20,y:190},{x:30,y:180},{x:40,y:170},{x:50,y:160},{x:60,y:150},{x:70,y:140},{x:80,y:130},{x:90,y:120},{x:100,y:110}],inputStream=new Readable({objectMode:!0});inputStream._read=function(){sampleData.forEach(function(t){inputStream.push(t)}),inputStream.push(null)};var outputStream=new Writable({objectMode:!0});outputStream._write=function(t,e,r){console.log(t),r()};var greater50Stream=new QueryStream({x:{$gt:50}});inputStream.pipe(greater50Stream).pipe(outputStream);

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