expt

(expt base power)

Returns base raised to power. With integer arguments the result is an exact integer ((expt 2 10) is 1024), and a negative integer power gives the reciprocal ((expt 2 -1) is 1/2); if either argument is a float -- or the power is a ratio -- the result is a float, and a fractional power ((expt 2 0.5), (expt 10000.0 0.75)) works on every backend. The dispatch is on the run-time values, so a power computed at run time behaves like a literal one. On the WASM backends a fractional power is exp(y * log(x)) over the software exp/log (Math Function Backends), so its low-order digits differ from Math.pow's. Works in all three backends.