Answer & Solution
Answer: Option B
Solution:
The _.map function produces a new array of values by mapping each value in a list through a transformation function.
Q
What is the result of _.map([1, 2, 3], function(num) { return num * 3; })?
Related Questions on Average
How do you generate a random number within a range in Underscore.js?
A). _.random
B). _.range
C). _.shuffle
D). _.sample
How do you extend an object with properties from other objects in Underscore.js?
A). _.clone
B). _.extend
C). _.omit
D). _.pick
Which function is used to find unique elements in an array in Underscore.js?
A). _.first
B). _.last
C). _.uniq
D). _.filter
Which function is used to clone an object in Underscore.js?
A). _.extend
B). _.clone
C). _.map
D). _.filter
What does _.keys({one: 1, two: 2, three: 3}) return?
A). [1, 2, 3]
B). ['one', 'two', 'three']
C). ['1', '2', '3']
D). [1, 2, 'three']
What does the _.filter function do in Underscore.js?
A). Iterates over a list of elements
B). Creates a new array with transformed values
C). Filters values in a list
D). Reduces the list to a single value
How do you check if a value is an array in Underscore.js?
A). _.isObject
B). _.isArray
C). _.isArguments
D). _.isString
What is the result of _.reduce([1, 2, 3], function(sum, num) { return sum + num; }, 0)?
A). 6
B). 5
C). 3
D). 2
What does _.pluck([{a: 1}, {a: 2}, {a: 3}], 'a') return?
A). [1, 2, 3]
B). [1, 2]
C). [2, 3]
D). [3, 1]
What does the _.each function do in Underscore.js?
A). Iterates over a list of elements
B). Creates a new array with transformed values
C). Filters values in a list
D). Reduces the list to a single value