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JavaScript JavaScript Foundations Numbers Comparisons

John Grillo
John Grillo
30,241 Points
Posted by John Grillo
John Grillo
30,241 Points

Fine point differences between '==' and '===' ?

I just want to learn the greater differences and fine points--and pitfalls--of the '==' and '==='. I'm not sure I understood all the salient points of the video, even with the transcript.

1 Answer

William Li
PLUS
William Li
Courses Plus Student 26,868 Points
William Li
William Li
Courses Plus Student 26,868 Points 
"6" == 6  // true
"6" === 6  // false

0 == false  //true
0 === false //false

You see here, === is stricter comparison because it requires the two objects being compared to are of the same type, whereas == allows type conversion before comparing.

In his iconic JavaScript book, JavaScript: The Good Parts, Douglas Crockford argues that you should always use === and forget about ==, and you should probably listen to him.