re: What you need to know about Javascript's Implicit Coercion VIEW POST


I don't know if it actually fits into the implicit coercion stuff, since it is more about optimization, but since ES2015, the signed 64 bit float representation (52 bit of mantissa, 11 bit of binary exponent and 1 bit for the sign) of Number is now no longer the only available representation of numeric values (which was required in order to work with asm.js and Web Assembly).

Modern JS vms like v8 will therefore keep an extra internal flag if it knows that a number is an integer instead of a float throughout the scope and then run the faster non-floating-point calculations on them. To "coerce" a floating point number to such an integer for the rest of the scope, be sure to add | 0; to any calculation that may result in an odd result.

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