Slicing strings

Questions
1

Is it possible to slice strings from cell contents?

I want students to write “y = x + 4” but I only want to parse “x + 4.” I can’t find a function to slice the input string. Does one exist? Or ideas for workarounds?

Thanks!

2

You can separate equations into LHS expressions and RHS expressions using parseEquation.

parseEquation(input).rhs

3

For that example you might also consider using “xyLine”

myLine = xyLine(studentInput.latex)
mySlope = slope(myLine)
myType = 
when isLineVertical(myLine) "Vertical Line x=${xInterceptOfLine(myLine)} " 
when isLineHorizontal(myLine) "Horizontal Line with  y="${yInterceptOfLine(myLine)} "
otherwise "Your line is not Vertical nor Horizontal"

https://teacher.desmos.com/computation-layer/documentation#types:xyLine

4

…I suppose you should use Types instead of Function

myLine = xyLine(studentInput.latex)
mySlope = myLine.slope
myType = 
when myLine.isVertical "Vertical Line x=${myLine.xIntercept} " 
when myLine.isHorizontal "Horizontal Line with  y="${myLine.yIntercept} "
otherwise "Your line is not Vertical nor Horizontal"