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Answer: `var`: Declares a variable that is scoped to the function or global scope. It can be re-declared and re-assigned within its scope. `var` declarations are hoisted, which means they are moved to the top of their scope, allowing you to use them before their declaration, but they will be undefined until the line where they are assigned.
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.
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.
29 kwi 2024 · 11. What are global variables? How are these variable declared? Global variables are available throughout the length of the code so that it has no scope. The var keyword is used to declare a local variable or object. If the var keyword is omitted, a global variable is declared. Example: // Declare a global: globalVariable = “Test”;
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:
30 paź 2024 · JavaScript interview questions range from the basics like explaining the different data types in JavaScript to more complicated concepts like generator functions and async and await. Each question will have answers and examples you can use to prepare for your own interview.
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.
