A callback function in JavaScript is a function that is passed as an argument to another function and is invoked after some kind of event.
参考: https://stackoverflow.com/questions/8228281/what-is-the-function-construct-in-javascript (function() { } )()有时会看到这种写法 It’s an Immediately-Invoked Function Expression, or IIFE for short. It executes immediately after it’s created...
JavaScript Engine:The JavaScript engine is a program or interpreter that executes code. Popular engines include V8 (used in Chrome and Node.js),SpiderMonkey(used in Firefox), andJavaScriptCore(used in Safari). The engine reads and processes JavaScript code, optimizes, and executes the instructions....
Which means they’re immediately called at runtime - also we can’t call them again they run just once like this: var logMyName = (function (name) { console.log(name); // Todd })('Todd'); The secret sauce here is this, (which I’ve assigned to a variable in the previous ...
What does "object destructuring" mean and what is the result of a destructuring operation?Say you have an object with some properties:const person = { firstName: 'Tom', lastName: 'Cruise', actor: true, age: 57 }You can extract just some of the object properties and put them into ...
The second part creates the immediately invoked function expression () through which the JavaScript engine will directly interpret the function. Examples: The function becomes a function expression which is immediately executed. The variable within the expression can not be accessed from outside it. 1...
What does factory function do here? Here root is window object. Is factory a default java script function? In what kind of scenarios this type of code can be used. This code is fromtoggle.js from Simon Tabor. Zepto and ender are libraries. Is this mostly used in libraries. ...
Only the outermost for-expression is evaluated immediately, the other expressions are deferred until the generator is run.▶ is not ... is not is (not ...)>>> 'something' is not None True >>> 'something' is (not None) False💡...
Prior to NDB 8.0.27, changes to the privileges of a user or role were synchronized immediately with all connected SQL nodes. Beginning with MySQL 8.0.27, an SQL node takes a global read lock when updating privileges, which keeps concurrent changes executed by multiple SQL nodes from causing ...
and their implications are not immediately visible. David pointed out to me — in one of the comments — that “indirect eval” is not a well-known idiom except in close circles of implementors. And he was right. There was in fact tons of confusion on the subject of global eval, all ...