How do i eliminate the trailing zero in the javascript calculator

4 
  if (calc.input === 0) {

You are already checking if the calcl.input is 0, so why don’t you just specify what you want to pass to setCalc in that situation. Then in an else statement, do something different?

FYI - Your calculator styling (fonts, colors, layout) looks almost identical to another project, so make sure yours is unique.