let and const is correct?
let and const are block scoped, but const cannot be re-assigned.
How can you avoid variable hoisting issues with let?
A). Declare variables at the bottom of the code
B). Use var instead
C). Declare variables at the top of their scope
D). Do not declare variables
What will be the output of the following code?
let f = 10; if (true) { console.log(f); let f = 20; }A). 10
B). 20
C). undefined
D). ReferenceError
What is the 'temporal dead zone'?
A). The period during which a variable is declared but not yet initialized
B). The time when the variable is accessible throughout the program
C). The period after variable initialization
D). None of the above
What will be the output of the following code?
console.log(a); let a = 10;A). undefined
B). 10
C). null
D). ReferenceError
What will be the output of the following code?
let d; console.log(d); d = 15;A). undefined
B). 15
C). null
D). ReferenceError
What will be the output of the following code?
let h = 40; { console.log(h); h = 45; } console.log(h);A). 40 45
B). 45 45
C). undefined undefined
D). ReferenceError 45
Which of the following is true about let declarations?
A). They are hoisted and initialized at the top of their scope
B). They are hoisted but not initialized
C). They are not hoisted at all
D). They are function scoped
Where should let variables be declared to avoid TDZ issues?
A). At the top of the global scope
B). At the bottom of their block scope
C). At the top of their block scope
D). Anywhere in the code
What will be the output of the following code?
let e = 25; function test() { console.log(e); let e = 30; } test();A). 25
B). 30
C). undefined
D). ReferenceError
In which scope are let variables hoisted?
A). Function scope
B). Block scope
C). Global scope
D). Module scope