Answer & Solution
Answer: Option C
Solution:
The _.filter function looks through each value in a list and returns an array of all the values that pass a truth test (predicate).
Q
What does the _.filter function do in Underscore.js?
Related Questions on Average
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
What does _.identity(value) return?
A). null
B). undefined
C). The same value
D). A new value
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 is the output of _.last([1, 2, 3, 4, 5], 2)?
A). [1, 2]
B). [4, 5]
C). [5]
D). [3, 4, 5]
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
How do you flatten a nested array using Underscore.js?
A). _.map
B). _.flatten
C). _.filter
D). _.reduce
How do you check if a value is an array in Underscore.js?
A). _.isObject
B). _.isArray
C). _.isArguments
D). _.isString
What does _.omit({name: 'Alice', age: 25, location: 'NY'}, 'age') return?
A). {name: 'Alice', location: 'NY'}
B). {age: 25}
C). {name: 'Alice', age: 25}
D). {location: 'NY'}
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]