what is the difference between != and !== conditions in java script?
10298
Difference between == and === in JavaScript
665
Which equals operator (== vs ===) should be used in JavaScript comparisons?
123797
Not equal  != operator on NULL
63854
How do boolean operators work in 'if' conditions?
106258
What is the reason that an empty string evaluates to false in Javascript
46395
Is it 100% correct to replace !!someVar with Boolean(someVar)?
3574
What is the !! (not not) operator in JavaScript?
155686
What is a reason of placing boolean or null before comparison operator?
107937
?: Operator Vs. If Statement Performance
42605
Is there a technical reason to use > (<) instead of != when incrementing by 1 in a 'for' loop?
32226
What does "options = options || {}" mean in Javascript?
72519
What's the difference between "==" and "=~"?
147362
Is ternary operator, if-else or logical OR faster in javascript?
23756
Why does one often see "null != variable" instead of "variable != null" in C#?
64194
Are =, , ==, !=, &&, and || used for arithmetic expressions or conditional expressions?
76808
Meaning of ! in Java syntax
105179
Do you prefer "if (var)" or "if (var != 0)"?