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Converting floating number into integer We can use ( number | 0 ) statement instead of parseInt(number) in Javascript. for example : ( 3.343 | 0) gives an integer value 3. Please Explain what is the logic behind ( number | 0 ) statement.

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  • I'ts a way in javascript of making a number into a integer. The Javascript Engine can then do certain optmizations,.. eg. Integer muliply / add etc, instead of double. Commented Aug 31, 2017 at 22:33
  • Are you asking how number | 0 works or why number | 0 is used rather than parseInt? Commented Aug 31, 2017 at 22:38
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    No, you should not use this instead of a proper parseInt. Commented Sep 1, 2017 at 0:34

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The | operator performs bitwise logical OR. It requires its parameters to be integers, so it will convert a string to an integer. So 

( number | 0 )

is equivalent to:

( parseInt(number, 10) | 0 )

Any number or'ed with 0 will return that same number, so that makes it equivalen to:

parseInt(number, 10)
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I think there might be some confusion from the OP about type coercion here too. In the case described above, the confusion is how "123" | 0 = 123.
No, those are not equivalent. Try with the input number = "0xFF". Or 1e11. Or 0b11. Or Infinity.
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Well, the single pipe between the number and 0 is bitwise operator that treat their operands as a sequence of 32 bits (zeroes and ones). https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#.7c_%28Bitwise_OR%29

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