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Improve set array values section #711

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Oct 2, 2020
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Improve set array values section #711

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16 changes: 11 additions & 5 deletions README.md
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Expand Up @@ -684,20 +684,26 @@ With this option enabled only environment variables starting with
i.e. The environment variable `CONFIG_FORCE_a_b__c___d` set the
configuration key `a.b-c_d`

### Set array values from env variables
### Set array values outside configuration files

Setting the value of array items from system properties requires
specifing the index in the array for the value. So, while in HOCON
you can set multiple values into an array or append to an array:
Setting the value of array items from java properties or environment
variables require specifying the index in the array for the value.
So, while in HOCON you can set multiple values into an array or
append to an array:

## HOCON
items = ["a", "b"]
items += "c"

Using java arguments you specify the exact position:
Using java properties you specify the exact position:

-Ditems.0="a" -Ditems.1="b"

as well as with environment variables:

export CONFIG_FORCE_items_0=a
export CONFIG_FORCE_items_1=b

### Concatenation

Values _on the same line_ are concatenated (for strings and
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