I haven't coded anything in Perl for a long time. Now I have started again and came across an interesting situation when coding two packages within a single '.pm' file. Until now I thought that if I define two packages…
all these code snippets run in nodejs. below are demo1.js, ps: run these code in nodejs rather than browser js engine // demo1.js var1 = 'var1'; // in nodejs or Chrome-V8 js engine, this line would create a property named…
When I write const path = require('path') outside the IIFE function I can't access it inside, but when I write it inside the function I am able to access it. Can anyone explain why is this happening? Can't access in…
I recently read "High Performance JavaScript" (2010) which states: The deeper into the execution context’s scope chain an identifier exists, the slower it is to access for both reads and writes. Consequently, local variables are always the fastest to access…
Below is a trivialized version of a solution I came across while trying to implement a version of the Jquery CSS function. function CSS(prop, value) { ... if (value === undefined) { // No matching elements. if (element == null)…
I have a function-returning function. The inner function makes use of the parent function's argument in its body. Then I make a list of functions produced by calling the parent function with different arguments. Here is an example: function f(a)…
I write JS (well, EcmaScript), but only relatively rarely. When writing on a member function for an object, I naturally often use other member variables and functions multiple times; but I tend to avoid defining my own globals, and no…
I have a function that lets me run a JavaScript function in the browser: export async function executeFunction(data: LoadOutput, input: Record<string, any>): Promise<any> { let args = []; for (let param of data.functionTree[0].parameters) { let value = input[param.name]; if(!value) {…
I am not able to reach a function which is a value of an attribute of an object . This only happens when function is called from another attribute. Calling the attribute carrying the function directly works just fine .…
Here are the simple code: { function a() {} a = "test"; } console.log(a); I expected to get "test" but got "ƒ a() {}" in console. Why is that? Can anyone explain this behaviour?