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first

first(text: String, amount: Number): String

Returns characters from the beginning of a string to the specified number of characters in the string, for example, the first two characters of a string.

If the number is equal to or greater than the number of characters in the string, the function returns the entire string.

Introduced in DataWeave version 2.4.0.

Parameters

Name Description

text

The string to process.

amount

The number of characters to return. Negative numbers and 0 return an empty string. Decimals are rounded down to the nearest whole number.

Example

This example returns the first five characters from a string.

Source

%dw 2.0
import first from dw::core::Strings
output application/json
---
"hello world!" first 5

Output

"hello"

first(text: Null, amount: Any): Null

Helper function that enables first to work with a null value.

Introduced in DataWeave version 2.4.0.