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EchoLabel[label][expr]

prints expr prepending label and returns expr.

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EchoLabel

EchoLabel[label][expr]

prints expr prepending label and returns expr.

Details

Examples

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Basic Examples  (1)

Print an intermediate result using a label:

Wolfram Language code: expr1;x = EchoLabel["sum:"][1 + 1];expr2

Scope  (1)

Print an intermediate result using a label:

Wolfram Language code: expr1;x = EchoLabel["power:"][2 ^ 3];expr2

Applications  (1)

Use different labels for different levels of a nested loop:

Wolfram Language code: Table[EchoLabel["outer"]@Table[EchoLabel["inner"][i], {i, j}], {j, 3}]

Properties & Relations  (5)

EchoLabel is an operator form of Echo:

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

Echo and EchoLabel give priority to the label:

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

EchoFunction gives priority to the function:

Wolfram Language code: EchoFunction[f][expr]

These cases are equivalent:

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

EchoLabel prints an intermediate result with a label:

Wolfram Language code: expr1;x = EchoLabel["factors:"]@FactorInteger[2 ^ 50 - 1];expr2

To print a property of an intermediate result, use EchoFunction:

Wolfram Language code: expr1;x = EchoFunction["factors:", Length]@FactorInteger[2 ^ 50 - 1];expr2

EchoLabel is disabled inside QuietEcho:

Wolfram Language code: QuietEcho[EchoLabel["label:"][expr]]
Wolfram Research (2020), EchoLabel, Wolfram Language function, https://reference.wolfram.com/language/ref/EchoLabel.html.

Text

Wolfram Research (2020), EchoLabel, Wolfram Language function, https://reference.wolfram.com/language/ref/EchoLabel.html.

CMS

Wolfram Language. 2020. "EchoLabel." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/EchoLabel.html.

APA

Wolfram Language. (2020). EchoLabel. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/EchoLabel.html

BibTeX

@misc{reference.wolfram_2026_echolabel, author="Wolfram Research", title="{EchoLabel}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/EchoLabel.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_echolabel, organization={Wolfram Research}, title={EchoLabel}, year={2020}, url={https://reference.wolfram.com/language/ref/EchoLabel.html}, note=[Accessed: 12-June-2026]}