Salesforce 31 Oct 2023
Authored by Sangeeta Ghosh
Computers
Professional Development
Used 3+ times
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20 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
How Many Future methods can be defined in a Class?
20
30
500
Any number of. There are no restrictions as such.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
function sayHi() {
console.log(name);
console.log(age);
var name = 'Lydia';
let age = 21;
}
sayHi();
Lydia and undefined
Lydia and ReferenceError
ReferenceError and 21
undefined and ReferenceError
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
for (var i = 0; i < 3; i++) {
setTimeout(() => console.log(i), 1);
}
for (let i = 0; i < 3; i++) {
setTimeout(() => console.log(i), 1);
}
0 1 2 and 0 1 2
0 1 2 and 3 3 3
3 3 3 and 0 1 2
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What's the output?
+true; !'Lydia';
1 and false
false and NaN
false and false
Answer explanation
The unary plus tries to convert an operand to a number. true is 1, and false is 0.
The string 'Lydia' is a truthy value. What we're actually asking, is "is this truthy value falsy?". This returns false.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
{}
ReferenceError: greetign is not defined
undefined
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
NaN
TypeError
"12"
3
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What's the output?
let number = 0;
console.log(number++);
console.log(++number);
console.log(number);
1 1 2
1 2 2
0 2 2
0 1 2
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