Left Shift by Powers of Two

The left shift operation is similar to multiplication by powers of two.

Sample calculation using the left shift operator (<<):

10 << 3 = 10 * 2^3 = 10 * 8 = 80
-32 << 2 = -32 * 2^2 = -32 * 4 = -128
5 << 2 = 5 * 2^2 = 5 * 4 = 20

Write a function that mimics (without the use of <<) the left shift operator and returns the result from the two given integers.

Examples

shiftToLeft(5, 2) ➞ 20

shiftToLeft(10, 3) ➞ 80

shiftToLeft(-32, 2) ➞ -128

shiftToLeft(-6, 5) ➞ -192

shiftToLeft(12, 4) ➞ 192

shiftToLeft(46, 6) ➞ 2944

Notes

• There will be no negative values for the second parameter y.
• This challenge is more like recreating of the left shift operation, thus, the use of the operator directly is prohibited.
• Alternatively, you can solve this challenge via recursion.
• A recursive version of this challenge can be found via this link.