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November 5, 2022 Comments Off on Questions Bank

Questions Bank › Category: JavaScript Essentials 1
We have declared an array of animals let animals = [“dog”, “cat”, “hamster”];. Then we call the method animals.pop();. As a result, the animals array will look like this:
OpenProgrammingAnswers asked 2 years ago • 
We want to convert the string “1024” to type Number and store the result in variable n. Point out the correct statement:
OpenProgrammingAnswers asked 2 years ago • 
Point out the correct declaration of the height variable:
OpenProgrammingAnswers asked 2 years ago • 
By default, JavaScript allows us to write to an undeclared variable (it declares it implicitly for us). If we want the interpreter to treat such a situation as an error, we have to:
OpenProgrammingAnswers asked 2 years ago • 
We want to declare a distance constant and initialize it with the value 120. What should such a declaration look like?
OpenProgrammingAnswers asked 2 years ago • 
Analyze the code snippet. Identify which variables are local and which are global: let name; let age; { let profession; { let height; let weight; }
OpenProgrammingAnswers asked 2 years ago • 
What does shadowing mean?
OpenProgrammingAnswers asked 2 years ago • 
We have declared an array let animals = [“dog”, “cat”, “hamster”];. We want to temporarily comment out the element “cat”, and to do this, we can modify the declaration as follows:
OpenProgrammingAnswers asked 2 years ago • 
We perform the operation: let x = “abcdefg”.slice(2, 4). As a result, the value:
OpenProgrammingAnswers asked 2 years ago • 
If a variable stores the value false, then the variable:
OpenProgrammingAnswers asked 2 years ago • 
We declare an object called dog, with two fields: age and name: let dog = { age: 5. name: “Axel” }; To change the value of the age field to 6, we need to perform:
OpenProgrammingAnswers asked 2 years ago • 
Performing the operation: let x = 20n + 10; will result in:
OpenProgrammingAnswers asked 2 years ago • 
Analyze the code snippet: let counter = 0; let userName = “John”; After declaring a counter variable, we want to put a short comment with information about what the variable is used for. To do this, we modify the line with the declaration to the form:
OpenProgrammingAnswers asked 2 years ago • 
Analyze the following code: let x = 10 / 100; console.log(typeof (x)); As a result of its execution:
OpenProgrammingAnswers asked 2 years ago • 
In order to check the number of elements of the array stored in the names variable, we call:
OpenProgrammingAnswers asked 2 years ago • 
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