Web Reference: Dec 11, 2008 Β· I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing idSele_UNVEHtype.value. I saw this code: this.vertical = vertical !== undefined ? !!vertical : this.vertical; It seems to be using !! as an operator, which I don't recognize. What does it do? I did see that description in that questions answer, but it's seemed like a repeat of well known JS boolean logic rather than a specific example.
YouTube Excerpt: This episode discusses combining the Array map method with the
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