Pipeline

As part of a data processing pipeline, complete the implementation of the make_pipeline method:

The method should accept a variable number of functions, and it should return a new function that accepts one parameter $arg.
The returned function should call the first function in the make_pipeline with the parameter $arg, and call the second function with the result of the first function.
The returned function should continue calling each function in the make_pipeline in order, following the same pattern, and return the value from the last function.

For example, make_pipeline(function($x) { return $x * 3; }, function($x) { return $x + 1; }, function($x) { return $x / 2; }) then calling the returned function with 3 should return 5.

PHP 7.3.10

Show starting code

<?php

function make_pipeline(...$funcs)
{
    return function($arg) use ($funcs)
    {
        return -1;
    };
}

$fun = make_pipeline( function($x) { return $x * 3; },
                      function($x) { return $x + 1; },
                      function($x) { return $x / 2; } );
echo $fun(3); # should print 5

Example case: Wrong answer
Various functions: Wrong answer
Various data types: Wrong answer

Use this question for your test

<< Previous Next >> Back to questions

Score Distribution

# of candidates

0-33%
34-66%
67-100%

Score

Would you like to see our other questions?

We have 850+ premium hand-crafted questions for 50+ job skills and 15+ coding languages. We prefer questions with small samples of actual work over academic problems or brain teasers.

Visit our question library

Private Concierge

Send us an email with an explanation of your testing needs and a list of candidates. We will create an appropriate test, invite your candidates, review their results, and send you a detailed report.

Contact Private Concierge

Would you like to see our tests? The following tests contain PHP related questions:

HTML/CSS, JavaScript, PHP, and SQL Online Test

PHP Online Test

PHP and SQL Online Test

PHP and WordPress Online Test

PHP, MySQL, and SQL Online Test

On the TestDome Blog

Screening Applicants: The Good, the Bad and the Ugly

Since we’re all biased and we use incorrect proxies, why not just outsource hiring to experts or recruitment agencies? After all, they’ve been screening people for many years, so they must know how to do it right?

Not really. I was surprised to discover that many experts disagree with each other. Everybody praises their pet method and criticizes the others. Many of these methods look legitimate, but are based on...