Created
March 23, 2021 20:07
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I was debugging some stuff in control-flow hell at work, and thought this might be useful. `eval()` outside of `<script>` tags doesn't work, but apparently it's just fine inside them.
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| <html> | |
| <script> | |
| function addone(v) { return v + 1; } | |
| function debugify(fn) { | |
| console.log("debugifying"); | |
| let source = fn.toString(); | |
| let parts = source.split(" "); | |
| let decl = parts[1]; | |
| let name = decl.replace(/\(.+\)/, ""); | |
| let params = decl.replace(/.+\(/, "").replace(/\)/, ""); | |
| let body = parts.slice(3, parts.length - 1).join(" "); | |
| let newfnsrc = `function ${name}(${params}) { console.log("${name}"); function _${name}(${params}) { ${body} }; return _${name}.apply(this, [${params}]); }`; | |
| // return new Function(newfnsrc); | |
| const test = eval(`(${newfnsrc})`); | |
| return test; | |
| } | |
| const dbg = debugify(addone); | |
| console.log(dbg(1)); | |
| </script> | |
| </html> |
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