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jsdryan/JavaScript Tricks.js

Created February 28, 2022 05:47
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JavaScript Tricks.js
// Show content if first variable is ture.
const theBoolean = true;
const thing = 'the awesome thing';
theBoolean && thing; // the awesome thing
// Judge the boolean of 'undefined', '', false
let userInput = '';
!!userInput; // false
let userInput; = undefined;
!!userInput; // false
let userInput = false;
!!userInput; // false
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