index Function

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index finds the first element index for a given value in a list.

index(list, value)

The returned index is zero-based. This function produces an error if the given value is not present in the list.

Examples

> index(["a", "b", "c"], "b")
1

In this example, the index of the first occurence of "two" is returned.

> index(["one", "two", "two"], "two")
1

Related Functions

• element retrieves a particular element from a list given its index.