ES2015

Question 1

var hello = ‘hello’;

function sayHi() {
  var hello = 'hi';
  console.log(hello);
}

sayHi();

Answer 1

‘hi”

Question 2

var student = { name: 'Ken' };
var student = { name: 'James' };

console.log(student);

Answer 2

‘James’

Question 3

var hello = ‘hello’;

function sayHi() {
  var hello = 'hi';
  console.log(hello);
}

sayHi();
console.log(hello)

Answer 3

hi

hello

Question 4

const student = { name: 'Ken' };
var student = { name: 'James' };

console.log(student);

Answer 4

give error

Question 5

you can declare a let or const variable with the same name in ____________

Answer 5

a different scope

Question 6

RETURNS

(function () {
  const student = { name: 'James' };

  function createStudent(name) {
    const student = { name: name };
    return student;
  }

console.log(createStudent(‘Ken’));
console.log(student);
})();

Answer 6

Ken

James

Question 7

use ______ when you need to assign a variable , or scope a variable at the block level

Answer 7

let

Question 8

use ______ when you don’t want a variable value to change through out the project

Answer 8

const

Question 9

let strToSearch = ‘a-really-long-hyphenated-string’;

console. log(/^a-really/.test(strToSearch)); // test string w/ regular expression
console. log(strToSearch.indexOf(‘a-really’) === 0); // indexOf
console. log(strToSearch.startsWith(‘a-really’)); // startsWith

Answer 9

all true

Question 10

let strToSearch = ‘a-really-long-hyphenated-string’;

console. log(/hyphenated-string$/.test(strToSearch)); // test string w/ regular expression
console. log(strToSearch.indexOf(‘hyphenated-string’) === strToSearch.length - ‘hyphenated-string’.length); // indexOf
console. log(strToSearch.endsWith(‘hyphenated-string’)); // endsWith

Answer 10

all true

Question 11

let strToSearch = 'a-really-long-hyphenated-string';
console.log(strToSearch.startsWith('a-really', 5)); // startsWith

Answer 11

false

starts at index 5

Question 12

let strToSearch = 'a-really-long-hyphenated-string';
console.log(strToSearch.endsWith('hyphenated-string', 22)); // endsWith

Answer 12

false

Question 13

let and const type variables can be accessed from ______.

Answer 13

nested scope

Question 14

let and const are best used for ______.

Answer 14

block level scopting

Question 15

MAKE TO ARROW FUN

this.getKeys = function () {
return Object.keys(this);
}

Answer 15

this.getKeys = () => {
return Object.keys(this);
}

Question 16

ADD DEFAULT VAULES FOR NAME, TIMEOFDAY

function greet(name, timeOfDay) {
  console.log(`Good ${timeOfDay}, ${name}!`);
}

Answer 16

function greet(name = "steve", timeOfDay = "day") {
  console.log(`Good ${timeOfDay}, ${name}!`);
}

Question 17

an arrow function is bound to it’s ______ scope

Answer 17

parent

Question 18

Given a function that has two default parameters. You want to keep the default value of the first parameter but override the default value of the second parameter. When calling the function, what value should the first parameter be?

Answer 18

undefined

Question 19

block level is any piece of code surrounded in ________

Answer 19

{}

braces

Question 20

var i; // i is declared in the containing scope
for(i = 0; i < 10; i++) {
  ... // some code
}
return i; //  accessible or no?

Answer 20

accessible here

Question 21

for(var i = 0; i< 10; i++){

}

return i; // i// accessible or no?

Answer 21

not accessible here in block scoped language