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
How do you check if a value is an array in Underscore.js?
A). _.isObject
B). _.isArray
C). _.isArguments
D). _.isString
What does _.identity(value) return?
A). null
B). undefined
C). The same value
D). A new value
How can you invoke a function a specified number of times in Underscore.js?
A). _.times
B). _.invoke
C). _.repeat
D). _.cycle
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 extend an object with properties from other objects in Underscore.js?
A). _.clone
B). _.extend
C). _.omit
D). _.pick
Which function can be used to delay the execution of a function in Underscore.js?
A). _.defer
B). _.delay
C). _.debounce
D). _.throttle
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
How do you debounce a function in Underscore.js to limit the rate at which it can fire?
A). _.throttle
B). _.debounce
C). _.delay
D). _.once
Which function is used to clone an object in Underscore.js?
A). _.extend
B). _.clone
C). _.map
D). _.filter