function abs( x ) {
	return Math.abs( x ); // eslint-disable-line stdlib/no-builtin-math
}
Computes the absolute value of a double-precision floating-point number `x`.

@param {number} x - input value
@returns {number} absolute value

@example
var v = abs( -1.0 );
// returns 1.0

@example
var v = abs( 2.0 );
// returns 2.0

@example
var v = abs( 0.0 );
// returns 0.0

@example
var v = abs( -0.0 );
// returns 0.0

@example
var v = abs( NaN );
// returns NaN