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Fix composable function typos. Clarify wording. #3252

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merged 7 commits into from
Mar 19, 2021
Merged

Fix composable function typos. Clarify wording. #3252

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4f09357
Fix composible function typos. Make wording clearer.
manzaloros Mar 18, 2021
6721f39
Reword composable function description.
manzaloros Mar 18, 2021
1e66e73
Update files/en-us/web/javascript/reference/global_objects/array/redu…
manzaloros Mar 18, 2021
336cf24
Merge branch 'main' of github.com:mdn/content
manzaloros Mar 18, 2021
dec54de
Fix composable spelling. Add Wiki link. Use updated description.
manzaloros Mar 18, 2021
792fb15
Merge branch 'main' of github.com:manzaloros/content
manzaloros Mar 18, 2021
b109b53
Use sentence case for titles; remove code comment and integrate Wiipe…
Mar 19, 2021
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27 changes: 10 additions & 17 deletions files/en-us/web/javascript/reference/global_objects/array/reduceright/index.html
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Expand Up @@ -324,23 +324,16 @@ <h3 id="Difference_between_reduce_and_reduceRight">Difference between <code>redu
console.log(left); // "12345"
console.log(right); // "54321"</pre>

<h3 id="Defining_Composible_Function">Defining Composible Function</h3>

<p>The concept of compose function is simple it combines n functions. It’s a flowing
right-to-left, calling each function with the output of the last one.</p>

<pre class="brush: js">/**
 * Function Composition is way in which result of one function can
 * be passed to another and so on.
 *
 * h(x) = f(g(x))
 *
 * Function execution happens right to left
 *
 * https://en.wikipedia.org/wiki/Function_composition
 */

const compose = (...args) =&gt; (value) =&gt; args.reduceRight((acc, fn) =&gt; fn(acc), value)
<h3>Defining composable functions</h3>

<p>Function composition is a mechanism for combining functions, in which the
output of each function is passed into the next one, and the output of the last
function is the final result. In this example we use <code>reduceRight()</code>
to implement function composition.</p>

<p>See also <a href="https://en.wikipedia.org/wiki/Function_composition_(computer_science)">Function composition</a> on Wikipedia.

<pre class="brush: js">const compose = (...args) =&gt; (value) =&gt; args.reduceRight((acc, fn) =&gt; fn(acc), value)

// Increment passed number
const inc = (n) =&gt; n + 1
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