Salesforce JavaScript Developer I Dumps

 

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Share some JavaScript Developer I Certification JavaScript Developer I exam questions and answers below.
Refer to the code below: 
let o = { 
get js() { 
let city1 = String("st. Louis"); 
let city2 = String(" New York"); 
return { 
firstCity: city1.toLowerCase(), 
secondCity: city2.toLowerCase(), 
} 
} 
} 
What value can a developer expect when referencing o.js.secondCity? 
A. ' new york ' 
B. Undefined 
C. An error 
D. ' New York ' 
Answer: A

Refer to the expression below: 
Let x = ('1' + 2) == (6 * 2); 
How should this expression be modified to ensure that evaluates to false? 
A. Let x = (1 + 2) == ( '6' / 2); 
B. Let x = ('1' + 2) == ( 6 * 2); 
C. Let x = (1 + 2 ) == ( 6 / 2); 
D. Let x = ('1' + ' 2') == ( 6 * 2); 
Answer: B

A developer is wondering whether to use, Promise.then or Promise.catch, especially when a 
Promise throws an error? 
Which two promises are rejected? 
Which 2 are correct? 
A. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error))); 
B. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ; 
C. Promise.reject('cool error here').then(error => console.error(error)); 
D. Promise.reject('cool error here').catch(error => console.error(error)); 
Answer: B,D

Which statement accurately describes the behaviour of the async/ await keyworks ? 
A. The associated class contains some asynchronous functions. 
B. The associated sometimes returns a promise. 
C. The associated function can only be called via asynchronous methods 
D. The associated function will always return a promise 
Answer: D

Refer to the code below: 
01 const exec = (item, delay) =>{ 
02 new Promise(resolve => setTimeout( () => resolve(item), delay)), 
03 async function runParallel() { 
04 Const (result1, result2, result3) = await Promise.all{ 
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')] 
06 ); 
07 return `parallel is done: $(result1) $(result2)$(result3)`; 
08 } 
} 
} 
Which two statements correctly execute the runParallel () function? 
Choose 2 answers 
A. runParallel () .then(data); 
B. Async runParallel () .then(data); 
C. runParallel () .then(function(data) 
return da 
D. runParallel ( ). done(function(data){ 
return data; 
}); 
Answer: C,D

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