verb

eval

EE-val

Eval (verb) means to run a piece of program code that is stored as a text string, rather than as compiled instructions. Example: “The script uses eval to run whatever formula the user types in.”

verb

To run a piece of program code that is stored as a text string, rather than as compiled instructions.

"The script uses eval to run whatever formula the user types in."

"Security experts warn against using eval on input you don't fully trust."

How to use eval

Learner’s notes

In plain EnglishIn programming, a command that takes text and runs it as if it were code. Informally, also used as shorthand for "evaluation".

Common mistake

Using eval on untrusted input (like text typed by a website visitor) is a well-known security risk, since it can run malicious code.

Common pairings

use eval an eval function eval script

Word forms

evaled past tense, evalled past tense, evals singular

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Fill the gap

Can you complete this real example?

The script uses _____ to run whatever formula the user types in.

Etymology

A shortening of "evaluate", used as both a programming keyword and informal shorthand for an evaluation or assessment.

Rhymes for eval

medieval primeval retrieval

See all rhymes for eval →

Frequently asked questions

What does “eval” mean?

The word “eval” means to run a piece of program code that is stored as a text string, rather than as compiled instructions. In plain terms, in programming, a command that takes text and runs it as if it were code. Informally, also used as shorthand for "evaluation".

How do you pronounce “eval”?

“Eval” is pronounced EE-val (/ˈiː.væl/ in IPA).

How do you use “eval” in a sentence?

Here is “eval” used in a sentence: “The script uses eval to run whatever formula the user types in.”

What part of speech is “eval”?

“Eval” is a verb.