January 2020
Intermediate to advanced
548 pages
13h 36m
English
Content preview from Clean Code in JavaScript
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Abstract equality and inequality
The abstract equality (==) and inequality (!=) operators rely on the same algorithm internally, which is responsible for determining whether two values can be considered equal. In this section, our examples will only explore ==, but rest assured that != will always simply be the opposite of whatever == is.
In the vast majority of cases, it is not advisable to rely on abstract equality because its mechanism can create unexpected results. Most of the time, you'll want to opt for strict equality (that is, === or !==).
Where both operands, the left-side and the right-side, are of the same type, then the mechanism is quite simple—the operator will check whether the two operands are identical values:
100 == 100; ...
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