JavaScript and other language that use losely defined vars

Hey anyone out there that uses JavaScript in a professional environment. I wanted to know the standard when comparing values using == and === operators. I was watching a video the explained that if you compared a sting with a value of \’5\’ and an int with a value of 5 it returns true using the == operator. They then suggested to use the === for everything. I know this is wrong because what if you wanted to compare some value nested in some polymorphic objects with different type defs say one being a student and the other being an instructor the === would always return false.

After much thought I came to the conclusion that it might be best to use === whenever possible and the == when only necessary.

Can you give me some insight on what the rule of thumb is in a professional environment?

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