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EchoFunction[f][expr]

prints f[expr] and returns expr.

EchoFunction[label,f][expr]

prints f[expr] prepending label and returns expr.

Details
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Examples  
Basic Examples  
Scope  
Properties & Relations  
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EchoFunction

EchoFunction[f][expr]

prints f[expr] and returns expr.

EchoFunction[label,f][expr]

prints f[expr] prepending label and returns expr.

Details

Examples

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Basic Examples  (2)

Print a property of an intermediate result:

Wolfram Language code: expr1;EchoFunction[Length][DateList[]];expr2

Report a property using a label:

Wolfram Language code: expr1;EchoFunction["length:", Length][DateList[]];expr2

Scope  (2)

Print a property of an intermediate result:

Wolfram Language code: expr1;EchoFunction[Length][DateList[]];expr2

Report a property using a label:

Wolfram Language code: expr1;EchoFunction["length:", Length][DateList[]];expr2

Properties & Relations  (5)

EchoFunction is an operator form of Echo:

Wolfram Language code: Echo[expr, "label:", f]
Wolfram Language code: EchoFunction["label:", f][expr]

EchoFunction gives priority to the function:

Wolfram Language code: EchoFunction[f][expr]

Echo and EchoLabel give priority to the label:

Wolfram Language code: Echo[expr, "label:"]
Wolfram Language code: EchoLabel["label:"][expr]

These cases are equivalent:

Wolfram Language code: Echo[expr]
Wolfram Language code: EchoFunction[][expr]
Wolfram Language code: EchoLabel[][expr]

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

Wolfram Language code: x = 1;EchoTiming[Pause[x++]];x
1.000552`

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

Wolfram Language code: x = 1;EchoFunction[AbsoluteTiming][Unevaluated[Pause[x++]]];x

EchoFunction is disabled inside QuietEcho:

Wolfram Language code: QuietEcho[EchoFunction[f][expr]]
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.

CMS

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

BibTeX

@misc{reference.wolfram_2026_echofunction, author="Wolfram Research", title="{EchoFunction}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/EchoFunction.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_echofunction, organization={Wolfram Research}, title={EchoFunction}, year={2015}, url={https://reference.wolfram.com/language/ref/EchoFunction.html}, note=[Accessed: 13-June-2026]}