Internally, this puts the number in a single-element Float64Arraytyped array and gets its buffer to read the value’s raw bits:
(new Float64Array([n])).buffer
Then it converts that buffer to a string of "1"s and "0"s by viewing the buffer as a Uint8Array and mapping each viewed byte to a binary string with .toString(2). Finally, it creates properties like exponent and mantissa by using [] array indexing, .substring, and .slice to extract the relevant bits.
Internally, this puts the number in a single-element
Float64Arraytyped array and gets itsbufferto read the value’s raw bits:Then it converts that buffer to a string of
"1"s and"0"s by viewing the buffer as aUint8Arrayand mapping each viewed byte to a binary string with.toString(2). Finally, it creates properties likeexponentandmantissaby using[]array indexing,.substring, and.sliceto extract the relevant bits.Similar to what asm.js and emscripten do. We even support negative zero correctly. :)