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<!DOCTYPE html>
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<title>Diggernaut: Documentation for Meta-Language | Methods for Entity Manipulations | Commands for Arguments</title>
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<h1>Entity Manipulations</h1>
<div>
<h2>Commands for Arguments</h2>
<p class="flow-text">
Arguments are very similar to variables, with only one difference - their values can not be changed in the process of digger's work.
Arguments are initialized automatically when the iterator is running. So on each iterator cycle, the arguments
takes values corresponding to this particular iteration. Like variables, arguments are often used for substituting values in queries,
CSS selectors, and commands that support value substitution.
</p>
<p class="flow-text">
You can use the <span class = "hlt2">argument_get</span> command to write a value of the argument to the register,
<span class = "hlt2">argument_append</span> and <span class = "hlt2">argument_prepend</span> to add the argument value to the end or beginning
of the register.
</p>
<p class="flow-text">
Examples of usage:
</p>
<div class="row">
<div class="col s12">
<ul class="tabs excdark">
<li class="tab col s1"><a class="active" href="#var_get">Reading argument to the register</a></li>
<li class="tab col s1"><a href="#var_get_1">Dynamic name for argument</a></li>
<li class="tab col s1"><a href="#var_get_2">Other operations</a></li>
</ul>
</div>
<div id="var_get" class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># SWITCHING TO THE BLOCK
- find:
path: .somepath
do:
# FILL THE REGISTER WITH THE VALUE OF `start_date` ARGUMENT
- argument_get: start_date
</code></pre>
</div>
<div id="var_get_1" class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># PRESET VARIABLE `somevar`
- variable_set:
field: somevar
value: 123
# SWITCHING TO THE BLOCK
- find:
path: .somepath
do:
# FILL THE REGISTER WITH THE VALUE OF `age_123` ARGUMENT
- argument_get: age_<%somevar%>
</code></pre>
</div>
<div id="var_get_2" class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># SWITCHING TO THE BLOCK
- find:
path: .somepath
do:
# SET `date` STRING AS VALUE OF THE REGISTER
- register_set: date
# ADD VALUE OF `start_date` ARGUMENT TO THE END OF THE REGISTER,
# USING ": " FOR JOINING VALUES
- argument_append:
field: start_date
joinby: ": "
# REGISTER VALUE: date: 2017-10-07
# ADD VALUE OF `start_date` ARGUMENT TO BE BEGINNING OF THE REGISTER,
# USING "" FOR JOINING VALUES
- argument_prepend:
field: start_date
joinby: ""
# REGISTER VALUE: 2017-10-07date: 2017-10-07
</code></pre>
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<p class="flow-text">
Next we will learn about static variables.
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