apply

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apply

apply is used to call a function. The argument before the pipe becomes function_input, and argument after colon is function name.
Example
Let's assume we have simple function called hello_world defined with below code. 
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{% assign input = function_input %}
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{% assign input["foo"] = "bar"  %}
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{% global function_output = input %}
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Now, you can call this function in hooks code using apply filter:
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{% assign fn_input = '{"foo": ""}' | parse %}
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{% assign fn_result = fn_input | apply: "hello_world" %}
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As a result, value of fn_result will be:
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{
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    "foo": "bar"
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}
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