As written in the official documentation, Only the following properties in the script are available to library users: enumerable global properties function declarations, variables created outside a function with var, and properties explicitly set on the global object. This would mean every property in the global this object are available to library users. Before ES6, … Read more
While Google Apps Script implements a subset of ECMAScript 5, there’s nothing forcing it to be asynchronous. While it is true that JavaScript’s major power is its asynchronous nature, the Google developers appear to have given that up in favor of a simpler, more straightforward API. UrlFetchApp methods are synchronous. They return an HttpResponse object, … Read more
You can use the V8 snapshot functionality to precompile the code. This still means that you have to have a full version of V8 running to load the snapshot (i.e., you don’t get stand-alone native code, it needs to run inside the V8 VM), so all you save is the compilation time. Also, the quality … Read more
Maximum length of a typed array in V8 is currently set to kSmiMaxValue which depending on the platform is either: 1Gb – 1byte on 32-bit 2Gb – 1byte on 64-bit Relevant constant in the code is v8::internal::JSTypedArray::kMaxLength (source). V8 team is working on increasing this even further on 64-bit platforms, where currently ArrayBuffer objects can … Read more
The proper syntax to destructure an object to existing variables is ({x, y} = {x: 1, y: 2}); This allows {x, y} = {x: 1, y: 2} to be an expression. Otherwise {x, y} is interpreted as a block with comma operator, this results in Unexpected token = error. It works without parentheses and a … Read more
Your intuition is right that the event loop is something that embedders should have control over. However, it is also a fundamental abstract concept of the JavaScript programming model. V8’s solution is to provide a default implementation that embedders can override; you can find it in the “libplatform” component: https://chromium.googlesource.com/v8/v8/+/master/src/libplatform/default-platform.cc#140 See also Relationship between event … Read more
V8 developer here. I can confirm that 2^24 is the maximum number of entries in a Map. That’s not a bug, it’s just the implementation-defined limit. The limit is determined by: The FixedArray backing store of the Map has a maximum size of 1GB (independent of the overall heap size limit) On a 64-bit system … Read more
This is what I use: var escapeShell = function(cmd) { return ‘”‘+cmd.replace(/([“‘$`\\])/g,’\\$1’)+'”‘; };
Object.defineProperty(global, ‘__stack’, { get: function(){ var orig = Error.prepareStackTrace; Error.prepareStackTrace = function(_, stack){ return stack; }; var err = new Error; Error.captureStackTrace(err, arguments.callee); var stack = err.stack; Error.prepareStackTrace = orig; return stack; } }); Object.defineProperty(global, ‘__line’, { get: function(){ return __stack[1].getLineNumber(); } }); console.log(__line); The above will log 19. Combined with arguments.callee.caller you can get … Read more
Setting maxArrayLength There are a few methods all of which require setting maxArrayLength which otherwise defaults to 100. Provide the override as an option to console.dir console.dir(myArry, {‘maxArrayLength’: null}); Set util.inspect.defaultOptions.maxArrayLength = null; which will impact all calls to console.log and util.format Call util.inspect yourself with options. const util = require(‘util’) console.log(util.inspect(array, { maxArrayLength: null … Read more