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EchoFunction
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EchoFunction

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EchoFunction[f][expr]

prints f[expr] and returns expr.

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EchoFunction[label,f][expr]

prints f[expr] prepending label and returns expr.

Details

Examples

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Basic Examples  (2)Summary of the most common use cases

Print a property of an intermediate result:

In[1]:=1
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https://wolfram.com/xid/0puypyj9zm-x0mej9
Out[1]=1

Report a property using a label:

In[1]:=1
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https://wolfram.com/xid/0puypyj9zm-0eosg4
Out[1]=1

Scope  (2)Survey of the scope of standard use cases

Print a property of an intermediate result:

In[1]:=1
✖
https://wolfram.com/xid/0puypyj9zm-88rgfa
Out[1]=1

Report a property using a label:

In[1]:=1
✖
https://wolfram.com/xid/0puypyj9zm-cr6zwg
Out[1]=1

Properties & Relations  (5)Properties of the function, and connections to other functions

EchoFunction is an operator form of Echo:

In[1]:=1
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https://wolfram.com/xid/0puypyj9zm-eioycc
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0puypyj9zm-4524kl
Out[2]=2

EchoFunction gives priority to the function:

In[1]:=1
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https://wolfram.com/xid/0puypyj9zm-rpx4g1
Out[1]=1

Echo and EchoLabel give priority to the label:

In[2]:=2
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https://wolfram.com/xid/0puypyj9zm-tkudoz
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0puypyj9zm-zc5qnz
Out[3]=3

These cases are equivalent:

In[1]:=1
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https://wolfram.com/xid/0puypyj9zm-tnwnz6
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0puypyj9zm-w52pnq
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0puypyj9zm-274bmu
Out[3]=3

EchoTiming can be used to print the timing of intermediate computations without affecting the result:

In[1]:=1
✖
https://wolfram.com/xid/0puypyj9zm-wip4pl
1.000552`
Out[1]=1

EchoFunction can also be used to print the timing, but at the cost of doing the computation twice:

In[2]:=2
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https://wolfram.com/xid/0puypyj9zm-8epnnt
Out[2]=2

EchoFunction is disabled inside QuietEcho:

In[1]:=1
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https://wolfram.com/xid/0puypyj9zm-byxu6r
Out[1]=1
Wolfram Research (2015), EchoFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/EchoFunction.html.
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Wolfram Research (2015), EchoFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/EchoFunction.html.

Text

Wolfram Research (2015), EchoFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/EchoFunction.html.

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Wolfram Research (2015), EchoFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/EchoFunction.html.

CMS

Wolfram Language. 2015. "EchoFunction." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/EchoFunction.html.

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Wolfram Language. 2015. "EchoFunction." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/EchoFunction.html.

APA

Wolfram Language. (2015). EchoFunction. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/EchoFunction.html

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Wolfram Language. (2015). EchoFunction. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/EchoFunction.html

BibTeX

@misc{reference.wolfram_2025_echofunction, author="Wolfram Research", title="{EchoFunction}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/EchoFunction.html}", note=[Accessed: 02-June-2025 ]}

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@misc{reference.wolfram_2025_echofunction, author="Wolfram Research", title="{EchoFunction}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/EchoFunction.html}", note=[Accessed: 02-June-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_echofunction, organization={Wolfram Research}, title={EchoFunction}, year={2015}, url={https://reference.wolfram.com/language/ref/EchoFunction.html}, note=[Accessed: 02-June-2025 ]}

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@online{reference.wolfram_2025_echofunction, organization={Wolfram Research}, title={EchoFunction}, year={2015}, url={https://reference.wolfram.com/language/ref/EchoFunction.html}, note=[Accessed: 02-June-2025 ]}