Answer & Solution
Answer: Option A
Solution:
The _.reduce function reduces a list of values to a single value by iteratively combining each value with an accumulator.
Q
What is the result of _.reduce([1, 2, 3], function(sum, num) { return sum + num; }, 0)?
Related Questions on Average
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
How do you extend an object with properties from other objects in Underscore.js?
A). _.clone
B). _.extend
C). _.omit
D). _.pick
What is the output of _.last([1, 2, 3, 4, 5], 2)?
A). [1, 2]
B). [4, 5]
C). [5]
D). [3, 4, 5]
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']
Which function is used to clone an object in Underscore.js?
A). _.extend
B). _.clone
C). _.map
D). _.filter
What is the result of _.map([1, 2, 3], function(num) { return num * 3; })?
A). [1, 2, 3]
B). [3, 6, 9]
C). [2, 4, 6]
D). [3, 6, 9, 12]
How do you shuffle the elements of an array in Underscore.js?
A). _.each
B). _.shuffle
C). _.sample
D). _.random
Which function is used to find unique elements in an array in Underscore.js?
A). _.first
B). _.last
C). _.uniq
D). _.filter
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 flatten a nested array using Underscore.js?
A). _.map
B). _.flatten
C). _.filter
D). _.reduce