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New Salesforce Developer JavaScript-Developer-I Exam Practice Questions

Total 215 Questions

Last Updated On: 20-Nov-2024

Question # 1

Given the code below: const copy = JSON.stringify([ new String(‘ false ’), new Bollean( false ), undefined ]); What is the value of copy?
A. -- [ \”false\” , { } ]--
B. -- [ false, { } ]--
C. -- [ \”false\” , false, undefined ]--
D. - [ \”false\” ,false, null ]--

- [ \”false\” ,false, null ]--

Question # 2

Considering type coercion, what does the following expression evaluate to? True + ‘13’ + NaN
A. ‘ 113Nan ’
B. 14
C. ‘ true13 ’
D. ‘ true13NaN ’

‘ true13NaN ’

Question # 3

A developer writers the code below to calculate the factorial of a given number. Function factorial(number) { Return number + factorial(number -1); factorial(3); What is the result of executing line 04?
A. 0
B. 6
C. -Infinity
D. RuntimeError

RuntimeError

Question # 4

Refer to the following code: What is the output of line 11?
A. [1,2]
B. ["bar", "foo"]
C. ["foo:1", "bar:2"]
D. ["foo", "bar"]

["foo", "bar"]

Question # 5

A developer has two ways to write a function: Option A: function Monster(){ this.growl = ()=>{ console.log('Grr!'); } } Option B: function Monster(){}; Monster.prototype.growl = ()=>{ console.log('Grr!'); } After deciding on an option, the developer creates 1000 monster objects. How many growl methods are created with Option A and Option B?
A. 1000 for Option A, 1 for Option B
B. 1 methods for both
C. 1000 for both
D. 1 for Option A, 1000 for Option B

1 methods for both

Question # 6

myArraym can have one level, two levels, or more levels. Which statement flattens myArray when it can be arbitrarily nested?
A. myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);
B. myArray. join (","). split (",");
C. [ ] .concat {. . .myArray) ;
D. myArray.flat(Infinity);

myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);

Question # 7

Refer to the following code block: What is the console output?
A. > Better student Jackie got 70% on test.
B. > Jackie got 70% on test.
C. > Uncaught Reference Error
D. > Better student Jackie got 100% on test

> Better student Jackie got 100% on test

Salesforce JavaScript-Developer-I Exam Dumps

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