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---
id: 5d792533a5c42fb4d1a4b70d
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title: Part 14
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challengeType: 0
2021-01-13 03:31:00 +01:00
dashedName: part-14
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---
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# --description--
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Replace the second argument of `str.replace` with an anonymous function, which takes `match` , `arg1` , `fn` , and `arg2` , and returns `infixToFunction["+"]` .
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# --hints--
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See description above for instructions.
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```js
assert(
code
.replace(/\s/g, '')
.includes('str.replace(regex,(match,arg1,fn,arg2)=>infixToFunction["+"])')
);
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```
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# --seed--
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## --before-user-code--
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```html
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" >
< title > Spreadsheet< / title >
< style >
#container {
display: grid;
grid-template-columns: 50px repeat(10, 200px);
grid-template-rows: repeat(11, 30px);
}
.label {
background-color: lightgray;
text-align: center;
vertical-align: middle;
line-height: 30px;
}
< / style >
< / head >
< body >
< div id = "container" >
< div > < / div >
< / div >
```
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## --after-user-code--
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```html
< / body >
< / html >
```
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## --seed-contents--
```html
< script >
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const infixToFunction = {
"+": (x, y) => x + y,
"-": (x, y) => x - y,
"*": (x, y) => x * y,
"/": (x, y) => x / y
};
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const infixEval = (str, regex) => str.replace(regex, infixToFunction["+"]);
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< / script >
```
# --solutions--
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```html
< script >
const infixToFunction = {
"+": (x, y) => x + y,
"-": (x, y) => x - y,
"*": (x, y) => x * y,
"/": (x, y) => x / y
};
const infixEval = (str, regex) =>
str.replace(regex, (match, arg1, fn, arg2) =>
infixToFunction["+"]
);
< / script >
```
