---
url: /docs/guide/usage/linter/rules/eslint/no-implied-eval.md
---

### What it does

Disallows passing strings to `setTimeout()`, `setInterval()`, and
`execScript()`.

### Why is this bad?

Passing a string to these APIs evaluates the string as JavaScript source
text at runtime. This has many of the same security, readability, and
performance problems as `eval()`. Pass a function instead.

### Examples

Examples of **incorrect** code for this rule:

```js
setTimeout("alert('Hi!')", 100);
setInterval("doWork()", 1000);
window.setTimeout("doWork()", 100);
```

Examples of **correct** code for this rule:

```js
setTimeout(() => alert("Hi!"), 100);
setInterval(doWork, 1000);
window.setTimeout(doWork, 100);
```

## How to use

## Version

This rule was added in v1.66.0.

## References