Comparison of datatypes in javascript | chai aur #javascript

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[skill.spirit]

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[elyramzan]

Type Conversion:-


> from to Numbers:
"33" => 33
"33abc" => NaN
true => 1; false => 0


> from to Boolean:
1 => true; 0 => false;
NaN => false;
"" => false;
"hitesh" => true;


>convert during operations
=>if string is written first then convert all after it to string:
"2" + 2 + 2 = 222
"1" + 2 = 12
=>if string comes after then the conversion occurs at last
2 + 2 + "2" = 42
1 + 1 + "2" + 2 + 1 = 2221


#use +operand to convert the operand to number

[Jai-xqhi]

I always got confused about javascript comparison results but I am now clear about the comparison and equality operators. Thank you for this type of valuable course.

[Sapien_]

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[engineeryt]

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[ambaradhikari]

The reason is that an equality check == and comparisons > < >= <= work differently. Comparisons convert null to a number, treating it as 0. That’s why (3) null >= 0 is true and (1) null > 0 is false.

On the other hand, the equality check == for undefined and null is defined such that, without any conversions, they equal each other and don’t equal anything else. That’s why (2) null == 0 is false.

null is treated in a special way by the Equals Operator (==). In a brief, it only coerces to undefined:

null == null; // true
null == undefined; // true
Value such as false, '', '0', and [] are subject to numeric type coercion, all of them coerce to zero.

[ziaa]

for those who are still confused:

1.console.log(null > 0); // false
Comparison (>) converts null to a number before comparing.

null is converted to 0.

0 > 0 is false.

2. console.log(null == 0); // false
The equality check (==) does not convert null to a number.

null is only equal to undefined in loose equality (==), not to numbers.

So, null == 0 is false.

3. console.log(null >= 0); // true
The >= comparison also converts null to a number (0).

It becomes 0 >= 0, which is true.

[Jdk]

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[ayush.tiwarios]

00:02 Comparison of datatypes in JavaScript
01:10 Comparing data types in JavaScript
02:19 When comparing values in JavaScript, make sure their data types are the same.
03:27 The comparison and equality operators in JavaScript have different behaviors.
04:36 JavaScript converts null to zero during comparison.
05:44 Comparison and equality checks in JavaScript
06:53 JavaScript datatype comparison with double and triple equal
07:50 Avoid confusing conversions and comparisons in JavaScript

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[amankishore]

In JavaScript, the correct way to check if a value is NaN is by using the Number.isNaN() function, rather than using the equality check

[Instrumentation]

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[pranjalgogoigaming-]

I never tried these things, Feeling awesome after learn these comparison....