lib/index.js
function exponent( x ) {
	// Extract from the input value a higher order word (unsigned 32-bit integer) which contains the exponent:
	var high = getHighWord( x );

	// Apply a mask to isolate only the exponent bits and then shift off all bits which are part of the fraction:
	high = ( high & EXP_MASK ) >>> 20;

	// Remove the bias and return:
	return high - BIAS;
}
function exponent( x ) {
	// Extract from the input value a higher order word (unsigned 32-bit integer) which contains the exponent:
	var high = getHighWord( x );

	// Apply a mask to isolate only the exponent bits and then shift off all bits which are part of the fraction:
	high = ( high & EXP_MASK ) >>> 20;

	// Remove the bias and return:
	return high - BIAS;
}
EXPONENT // 
FUNCTION: exponent( x )
Returns an integer corresponding to the unbiased exponent of a double-precision floating-point number.

@param {Number} x - input value
@returns {Number} unbiased exponent