ljs-built_in”>M正在拜访外部效 ark=”6hu”>f e ,/ul>
值，而是直接拜 n>
W { Z，咱们来看一个 plesBought = pa-mark=”6hu”>F =”6hu-3484-myplom() constlass=”hljs-numb（不运用全局变 9的：Math .ra/span>stass=”hljs javas函数可以使你更 变量）。
<可R l 65;
后
<, num2) hu”>x ; C k l [：它不该修正程 u”>O t Z .“>总结
<, num2) hu”>x ; C k l [：它不该修正程 u”>O t Z .“>总结
少次或co-2″>第三个条件 s = addApplesTo
如你 =”hljs-params”>括
经过>1。咱们numberOfAerOfApples =
纯函数背面的功能强大的概念 keyword">const< totalApples = ass="6hu-1974-mer">5;
中运用的概念， de> 的值。
id=”heading-0″>n>
你能 易于并行化
“hljs-keyword”>ript copyable”>de> 都没联系， js-keyword”>let值
以以” data-mark=”6hspan class=”6huyword”>const nu函数式编程言语 “>// 回来一个随pan class=”hljsles = add(numbe
Ma
自包括子
易于an>
函数不 "6hu">3 % x Rconst的。
以看 量）。
)/fApples + num1;72-mypl" data-m说说它们是什么 "hljs-comment"> class="hljs-co效果（修正全局 h.randomdata-mark="6hu"时调用该函数， span class="6hu
何 们来看一下 " data-mark="6hs-keyword">cons">% w B @ ] - span>pplesBough的随机数单了解，所以让 tota样的事情，不ata-id="headinghtc l ) : 7 span class="hlj-number">5 numb1) =>咱们看看非纯函 an class="6hu-1p> 用而它不该修正程序span class="hljpples 的简单调试data-mark="6hu"a-mark="6hu">t >k , g M R o } n>m() 时s="hljs-comment applesBng>为什么纯函数s-built_in">Matclass="6hu-2622eading-1">第二<6hu-2726-mypl" d函数也会发生同ss="hljs-functide>
adb C u E # J R V。学习和习惯纯 an>( numberOljs javascript t add = dApplesToTotal (5Math.cos(0)
明日仍是将来某 第一个条件：应 072-mypl" data-a-id="heading-3a-mark="6hu">i mark="6hu">R i ata-mark="6hu">, 5而它
an>ddApplesToTo调用该函数多少 ath.randpan class="hljsss="6hu-1998-my序的状态或引起 const a<要的概念，由于 u">9 Q ptotalApples更
现在 而，addAp函数式编程的更 mypl" data-mark() totalAppl-1886-mypl" datnt">// 回来一个>纯 totalApp-mark="6hu">7 E输出一直为m1n>自包括的。
/p>
s="heading" datN } : 0tan>lApples = <br />
<s(<span class="6mment">// 1</spde> 不是自包括 {<br />
totalApples 。</p>
<p>你可 "6hu-3600-mypl"/p></p>
<ul>
<li>它= <span class=") <span class=""hljs-comment"> 5 8 ^ g /</spH T , N o r F</="6hu-1701-myplan class="6hu-3副效果</h2>
<p>+= applesBoughtconst</span> ap-comment">// ..s-params">nu<spplesToTotal</cohljs-comment">/-number">5</spa>m m v v</span>说 <code>Math.rspan class="6hu</p>
<p>纯函数是所有n><br />
<span class=，因而咱们不能 u">j * V { . % n<span class="6 Z 2 r _ e </sp"6hu">x 2 G x</U `</span></spaspan class="6hu<span class="hl data-mark="6hu数：</p>
<ul>
<-2109-mypl" dat到，函数 <code>span>所见，每次数学术语我就不 li>它应一直回来copyable"><span"hljs-keyword">随时间或每次调 个时分调用它。<eyword">const</s, applesBoughtypl" data-mark=><span class="h-3256-mypl" dat不同的随机数</s class="hljs-kepan class="hljsmark="6hu">i 3 41-mypl" data-mg></p>
<ul>
<li这个规范也很简 ing" data-id="hipt copyable"><160-mypl" data-pan class="hljsnnected.com，作span>规范：自包t">// 10</span>"hljs-built_in"ass="hljs-numbean class="hljs-ass="hljs javas？它打破了前面 les, applesBoug-135-mypl" dataer<span class="="hljs-number"></p>
<pre><code clashljs-function">的两个规范！！<
<p>从上一个示例></p>
<pre><code cl totalApp<span ss="hljs-keyworpan class="hljs从前面的不纯函 m1 + num2;
<spaples = <span clought = <span c它是函数式编程 访外部规模。因 ark="6hu">Y H b/10</span><br />
</con><br />
<span class=：levelup.gitco的根底，它答应 相同的值。不论 ="6hu-1554-myplass="heading" dl</code> 运用的plesBought = <s论调用该函数多 an class="6hu-9程中一个基本但 c ^ 5</span>条是上面界说的变 .rando<span cla6hu-1426-mypl" ss="6hu-1512-my"heading" data-
</p>
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