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24 wrz 2024 · Struggling to find a frontend job? Make sure you can answer these 17 JavaScript variable questions first 👇: 1. What is a variable in JavaScript? A variable is a container that holds data. You can think of it as a label for a specific spot in memory where information is stored.
30 paź 2024 · The var keyword declares a global variable, which means that the variable can be accessed from anywhere in the code. The let keyword declares a local variable, which means that the variable can only be accessed within the block of code where it is declared. JavaScript let keyword example. | Image: Akshay Kumar . 9. What Are Closures in JavaScript?
11 cze 2024 · Question 18. Explain call, apply, and bind methods in JavaScript.Answer: ´call´ and ´apply´ methods invoke a function with a specified ´this´ context. ´call´ takes arguments separately while ´apply´ takes arguments as an array. ´bind´ returns a new function, permanently bound to the provided ´this´ context. Question 19.
3 sty 2024 · Example 2: var obj = { name: "vivek", getName: function(){ console.log (this.name); } } obj.getName (); In the above code, at the time of invocation, the getName function is a property of the object obj , therefore, this keyword will refer to the object obj, and hence the output will be “vivek”. Example 3:
5. Avoid Global Variables. Global variables can be accessed and modified from anywhere in the code, leading to potential conflicts and hard-to-find bugs. Minimize the use of global variables by encapsulating them within functions or modules.
3 sty 2020 · The var keyword makes a global variable and when we push a function we return the global variable i. So when we call one of those functions in that array after the loop it logs 5 because we get the current value of i which is 5 and we can access it because it's a global variable.
The closure has access to variables in three scopes; specifically: (1) variable in its own scope, (2) variables in the enclosing function’s scope, and (3) global variables. Here is an example:
