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Showing content from https://webplatform.github.io/docs/javascript/operators/subtraction below:

subtraction · WebPlatform Docs

subtraction Summary

Subtracts the value of one expression from another or provides unary negation of a single expression.

Syntax

result = number1 - number2 ;

result: Any numeric variable.
number1: Any numeric expression.
number2: Any numeric expression.

Examples

var x = 5;
var y = 7;
var z;
z = y - x;

Remarks

In Syntax 1, the - operator is the arithmetic subtraction operator used to find the difference between two numbers. In Syntax 2, the - operator is used as the unary negation operator to indicate the negative value of an expression.

For Syntax 2, as for all unary operators, expressions are evaluated as follows:

If applied to undefined or null expressions, a run-time error is raised.
Objects are converted to strings.
Strings are converted to numbers if possible. If not, a run-time error is raised.
Boolean values are treated as numbers (0 if false, 1 if true).

The operator is applied to the resulting number. In Syntax 2, if the resulting number is nonzero, result is equal to the resulting number with its sign reversed. If the resulting number is zero, result is zero.