The Weird Side Of JavaScript

JavaScript has its quirks. In this blog post, we’ll explore the weird side of JavaScript that may leave you scratching your head. These quirks are not necessarily bad or wrong but are intriguing.

🧭Table Of Contents

• Arrays equal strings
• Arrays are not equal
• Numbers are sorted alphabetically
• String is not a string
• Null comparison
• NaN is a number
• Arrays and objects
• Boolean maths
• Conclusion

Arrays equal strings

var a = [0, 1, 2];
var b = [0, 1, 2];
var c = '0, 1, 2';

a == c // true
b == c // true
a == b // false

Arrays are not equal

['a', 'b'] !== ['a', 'b']    // true

['a', 'b'] != ['a', 'b']     // true

['a', 'b'] == ['a', 'b']     // false

Numbers are sorted alphabetically

[10, 9, 8, 3, 2, 1, 0].sort();

// [0, 1, 10, 2, 3, 8, 9];

String is not a string

typeof 'Arafat';             // "string"

'Arafat' instanceof String;  // false

Null comparison

0 > null                // false

0 < null                // false

0 >= null               // true

0 == null               // false

0 <= null               // true

typeof null             // "object"

null instanceof Object  // false

NaN is a number

typeof NaN       // 'Number'

123 === 123      // true

NaN === NaN      // false

Arrays and objects

[] + []     // ""

[] + {}     // "[object Object]"

{} + []     // 0

{} + {}     // NaN

Boolean maths

true + false           // 1

true + true == true    // false

Conclusion

Don't worry. It stops to get weird if you know why. 🙈

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Credit: @thecodecrumbs🔥

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Comments

[Mykhailo Toporkov 🇺🇦]

For someone, it may look confusing (hell man, wtf js), but that is how js works under the hood. It is a dynamic typed language. Personally, for me, that is not the big deal cause I never ever use not type strict comparison.