**Operator Type:**

**Operator Scope of Action:**

**Operator Purpose:**

**Operator First Added:**

**Operator Last Altered:**

**Operator Uses Scoped Arguments:**

**Operator Has Newer Dot-Operator Variant:**

Function [other Function type actions]

Group [operators of similar scope]

Mathematical [other Mathematical operators]

Baseline

As at baseline

[More on scoped arguments in Action Code]

Yes

**sum(scope, expressionStr)**

This computes the arithmetic Number of every **expressionStr** value in each in-**scope** item (defining **scope**). See sum_if() for a related conditional operator.

The **sum()** operator omits notes for which $Searchable is `false`

.

**expressionStr** can be an expression, but is typically a Number-attribute value or a List/Set holding a list of numbers. It can also be a literal number 1, i.e. if the test is `true`

from that item then add one to the retuned value of sum(). The latter is less likely than with the sibling operator sum_if().

For example,

`$MyNumber = sum(children,$WordCount);`

constructs the current word count of the children of the note.

See also List/Set.sum().