Math.count

The number of items in a list of numbers, checking it is a list. Cloud9Trader adds it to JavaScript’s built-in Math.

count(x: number[]): number;

Parameters

• x: an array of numbers, such as the result of prices().

Same as x.length, but stops the run if x is not an array.

Errors

Stops the run if x is not an array: “Value passed to Math.count() must be an array of numbers”.

Example

function onIntervalClose() {
  log("count", Math.count(prices(10)));
}