Created
January 30, 2017 06:46
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Falsy Bouncer
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| function bouncer (arr) { | |
| var bouncedArr = arr.filter(Boolean); | |
| console.log(bouncedArr); | |
| return bouncedArr; | |
| } | |
| bouncer([7, "ate", "", false, 9]); |
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Boolean is an object wrapper for boolean values. It's not crystal clear to me what the F that means, but it's very useful. Why? Because as the documentation says "If the value is omitted or is 0, -0, null, false, NaN, undefined, or the empty string (""), the object has an initial value of false", which is great, as that's exactly what we need inside our filter. We want items that do not fulfill our filter, or false items will be filtered out. That's why arr.filter(Boolean); gets rid of all Nan undefined or "" items