create a function that is defined by parts in matlab in javascript

In MATLAB, you can define a function that is defined by parts, using the piecewise function. In JavaScript, you can achieve the same behavior using an if-else statement within the function. Here is an example function f(x) that returns different values depending on the input value of x.

index.tsx
function f(x) {
  if (x < 0) {
    return -x;
  } else if (x >= 0 && x <= 2) {
    return x^2;
  } else {
    return 4;
  }
}
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In this example, the function f(x) returns -x if x is less than 0, returns x^2 if x is between 0 and 2, and returns 4 otherwise.