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Chinweuba Elijah Azubuike

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

**Predicates** are functions that examine a condition and send a boolean value (true or false). We have predicate functions like the even number. You can search for these shots to see their functionality as each predicate function has been treated in detail separately.

`some`

function?The **some**** function** takes in a predicate method to evaluate the parameter passed. While evaluating the parameters, the `some`

function returns `true`

on the first parameter that satisfies the predicate method.

(some? p1 pn)

The some syntax

Here,

is the predicate function and **p1**

is the parameter to be tested.**pn**

The `some`

function receives a predicate function to evaluate the passed parameter, as we will see in an example shortly.

The `some`

function returns `true`

once it finds the parameter that satisfies the predicate method. It returns `nil`

if none of the parameters satisfies the predicate method.

(ns clojure.examples.example(:gen-class))(defn func [](println (some zero? '(2 4 6))))(func)

An example of the some function

- Line 3: We define a function,
`func`

. - Line 4: We use a predicate method
`(zero)`

alongside the`some`

function to evaluate the passed parameter`2 4 6`

. Then, we print out the output. Notice that the output is`nil`

because even though the values passed are numbers, all values fail the test by the`zero`

predicate function because the`zero`

predicate function checks to see if a number is zero. - Line 6: We call the
`func`

function.

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Chinweuba Elijah Azubuike

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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