How do you check if a value is an array in ES6?
A). Array.isArray(value)
B). value.isArray()
C). value instanceof Array
D). typeof value === 'array'
How do you define a default parameter in a function?
A). function(a, b = 2) {}
B). function(a, b: 2) {}
C). function(a, b = [2]) {}
D). function(a, b := 2) {}
What is the output of const x = 10; x = 20;?
A). 20
B). 10
C). Error
D). undefined
What is the output of [...'hello']?
A). ['hello']
B). ['h', 'e', 'l', 'l', 'o']
C). [104, 101, 108, 108, 111]
D). ['h', 'e', 'll', 'o']
How do you create a generator function in ES6?
A). function* gen() {}
B). function gen*() {}
C). function*gen() {}
D). function * gen() {}
What is the syntax for an arrow function in ES6?
A). function(a, b) { return a + b; }
B). (a, b) => { return a + b; }
C). (a, b) => a + b
D). Both B and C
What is the output of const [a, b] = [1, 2];?
A). a = 1, b = 2
B). a = [1], b = [2]
C). a = 2, b = 1
D). Error
How do you export a function in ES6 modules?
A). export function myFunc() {}
B). module.exports = myFunc;
C). exports.myFunc = function() {}
D). export myFunc = function() {}
What keyword is used to declare a block-scoped variable in ES6?
A). var
B). let
C). const
D). function
What is the output of typeof Symbol('description')?
A). 'string'
B). 'object'
C). 'symbol'
D). 'undefined'