Online Access Free JavaScript-Developer-I Practice Test

Given:
const str = ' Salesforce ' ;
Which two statements result in ' Sales ' ?

• A.str.substring(1, 5);
• B.str.substr(0, 5);
• C.str.substr(1, 5);
• D.str.substring(0, 5);

Correct implementation of try...catch for countsDeep():

• A.setTimeout(function() {
  try {
  countsDeep();
  } catch (e) {
  handleError(e);
  }
  }, 1000);
• B.try {
  setTimeout(function() {
  countsDeep();
  }, 1000);
  } catch (e) {
  handleError(e);
  }
• C.try {
  setTimeout(function() {
  countsDeep();
  }, 1000);
  } catch (e) {
  handleError(e);
  }
• D.try {
  countsDeep();
  } handleError (e){
  catch(e);
  }

A developer wants to advocate for a mature, well-supported web framework/library instead of a new one (Minimalist.js).
Which two should be recommended?

• A.Vue
• B.Express
• C.Koa
• D.React

A developer executes:
document.cookie;
document.cookie = ' key=John Smith ' ;
What is the behavior?

• A.Cookies are not read because line 01 should be document.cookies, but the key value is set and all cookies are wiped.
• B.Cookies are read and the key value is set, and all cookies are wiped.
• C.Cookies are read and the key value is set, the remaining cookies are unaffected.
• D.Cookies are read, but the key value is not set because the value is not URL encoded.

01 function Animal(size, type) {
02 this.type = type || ' Animal ' ;
03 this.canTalk = false;
04 }
05
06 Animal.prototype.speak = function() {
07 if (this.canTalk) {
08 console.log( " It spoke! " );
09 }
10 };
11
12 let Pet = function(size, type, name, owner) {
13 Animal.call(this, size, type);
14 this.size = size;
15 this.name = name;
16 this.owner = owner;
17 }
18
19 Pet.prototype = Object.create(Animal.prototype);
20 let pet1 = new Pet();
Given the code above, which three properties are set for pet1?

• A.speak
• B.canTalk
• C.type
• D.name
• E.owner