how to change text weight using expression

Question

I am using following code to create timer using slider and expression.

format I want it to be in is this 00m 00s but I am not able to change weight and size of 'm' and 's'. It is taking default as 00m 00s
can anybody help me out ?

slider = effect("Slider Control")("Slider");

seconds = Math.floor(slider%60);
minutes = Math.floor(slider/60);

function addZero(n) {
if(n < 10) {
return "0" + n
} else {
return n;
}
}

if (slider > 0) {
addZero(minutes) + "m " + addZero(seconds)+ "s"
} else {
"0m 0s"
}

Rick Gerard · Answer

The expression language tools for formatting text are currently limited to controlling the entire text layer. You can look at a text layer and copy the text properties of a single letter, but you can only apply that formatting to all of the text on another layer.

The solution to your problem is to use 4 text layers, preferably all set to monospaced fonts, one layer for Minutes, one for seconds, one for the M, and one for the S. Then you keep them lined up using sourceRectAtTime() and some padding or you write your expressions so that the seconds' layer always has two characters and you manually line them up and use parenting to keep them together. A monospaced font will keep the distance between the two seconds digits the same so the digits would not bounce around.

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