ECMAScript 2015 Mockest | JavaScript

1.

What keyword is used to declare a block-scoped variable in ES6?

A). var B). let C). const D). function

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2.

How do you declare a constant variable in ES6?

A). const B). let C). var D). function

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3.

What is the output of const x = 10; x = 20;?

A). 20 B). 10 C). Error D). undefined

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4.

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

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5.

How do you interpolate variables in a string using template literals?

A). Hello, + name + "!" B). Hello, ${name}! C). 'Hello, ' + name + '!' D). Both A and B

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6.

What does the ... operator do when used in a function parameter?

A). It spreads an array B). It restates the parameters C). It indicates a default parameter D). It represents the rest of the arguments

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7.

What is the result of [...['a', 'b', 'c']]?

A). ['a', 'b', 'c'] B). [['a', 'b', 'c']] C). ['abc'] D). Error

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8.

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) {}

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9.

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

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10.

How can you create a new promise in ES6?

A). new Promise(function) B). Promise(function) C). promise(function) D). New Promise(function)

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ECMAScript 2015 Mocktest

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