index.md

---

title: sum
slug: Web/XPath/Functions/sum

---

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The sum function returns a number that is the sum of the numeric values of each node in a given node-set.

Syntax

sum(node-set)

Arguments

• node-set

  • : The node-set to be evaluated. Each node in this node-set is evaluated as if it were passed to the number() function, and a sum of the resulting numbers is returned.

Returns

A number.

Notes

None.

Defined

XPath 1.0 4.3

Gecko support

Supported.