Falsy Bouncer

Remove all falsy values from an array.
Falsy values in JavaScript are false, null,0,"", undefined, and NaN.
Remember to use Read-Search-Ask if you get stuck. Write your own code.
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思路：

1.用到一个函数filter(),从数组中找到适合的元素

function judge(ele){    
return  Boolean(ele)!==false;
 }function bouncer(arr) { return arr.filter(judge);}bouncer([7, "ate", "", false, 9]);