Error unexpected string concatenation prefer template

prefer-template doesn't consider unary expressions in string concat as warning #3589 Comments dashed commented Aug 30, 2015 prefer-template doesn't

prefer-template doesn’t consider unary expressions in string concat as warning #3589

Comments

dashed commented Aug 30, 2015

prefer-template doesn’t consider unary expressions in string concat as warning.

It can be rewritten as the following; but prefer-template doesn’t emit a warning:

The text was updated successfully, but these errors were encountered:

eslintbot commented Aug 30, 2015

Thanks for the issue! We get a lot of issues, so this message is automatically posted to each one to help you check that you’ve included all of the information we need to help you.

Reporting a bug? Please be sure to include:

  1. The version of ESLint you are using (run eslint -v )
  2. The source code that caused the problem
  3. The configuration you’re using (for the rule or your entire config file)
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Prefer-template multiline #3507

Comments

Cellule commented Aug 24, 2015

Sometimes we break string in mulitple lines for lisibility like

The rule warns us to use template string when this is not needing and defeats the purpose.
Right now, there is a work around to add 2 template strings like

But I don’t know if this is something we want/should keep. see #3506

The text was updated successfully, but these errors were encountered:

eslintbot commented Aug 24, 2015

Thanks for the issue! We get a lot of issues, so this message is automatically posted to each one to help you check that you’ve included all of the information we need to help you.

Reporting a bug? Please be sure to include:

  1. The version of ESLint you are using (run eslint -v )
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Fix all out-of-the-box ESLint errors #2157

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samlasalle commented Aug 17, 2016 •

I have installed the angular-fullstack generator as per the instructions however I am getting a large amount of errors, most of them telling me that ‘angular’ is not defined, or that the expected indentation doesn’t match the generated indentation.

I have previously gotten this working on a different EC2 instance with none of these issues and I have no idea what I’ve done differently.

I can still enter the URL on my browser and the title is returned to that tab, and in the CLI where gulp serve is running it shows three GET requests with code 200, however no pages are being served. I am unsure what to do.

Attached is my output from gulp serve:

  • I understand that GitHub issues are not for tech support, but for questions specific to this generator, bug reports, and feature requests.
Item Version
generator-angular-fullstack 4.0.1
Node 6.2.2
npm 3.9.5
Operating System Ubuntu 14.04
Item Answer
Transpiler Babel
Markup HTML / Pug
CSS CSS / LESS / SCSS / Stylus
Router ui-router
Client Tests Jasmine / Mocha
DB MongoDB
Auth Y

The text was updated successfully, but these errors were encountered:

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Rule «no-useless-concat» reports false positive #3575

Comments

steffenweber commented Aug 29, 2015

If I’m not mistaken then this concatenation is not useless because number is not a string.

The text was updated successfully, but these errors were encountered:

eslintbot commented Aug 29, 2015

Thanks for the issue! We get a lot of issues, so this message is automatically posted to each one to help you check that you’ve included all of the information we need to help you.

Reporting a bug? Please be sure to include:

  1. The version of ESLint you are using (run eslint -v )
  2. The source code that caused the problem
  3. The configuration you’re using (for the rule or your entire config file)
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Requesting a new rule? Please be sure to include:

  1. The use case for the rule — what is it trying to prevent or flag?
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Quotes Refuses to Honor es6 Templates #7273

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joshrhoades commented Sep 28, 2016 •

Ok, trolled through similar issues, and they all seem to end up being solved with the addition of allowTemplateLiterals rule for quotes , but that isn’t working for me and I think I’m about out of options or missing something so blatantly obvious that I will literally mock a kangaroo just to cause him to punch me, so here we are typing things into the webernets as a last-ditch effort.

It seems as perhaps there is some Bermudian Traingulan (what, yeah I said it) thing where a confluence of rules are combined to make one of the pieces tip over. That or I am missing something ridiculous despite my efforts, or perhaps there is a true issue lurking.

The code itself is fine, it executes properly with no errors, nothing is off in that sense.

This happens with single or double , and whether or not I include the props for allowEscape or allowTemplateLiterals in any combination, including omitting them.

If I run only the recommended rules, no such errors are reported, though that shouldn’t be surprising.

Tell us about your environment

  • ESLint Version: @3.6.0 (via rollup-plugin-eslint @3.0.0)
  • Node Version: @5.6.0
  • npm Version: @3.10.8

What parser (default, Babel-ESLint, etc.) are you using?
Default

Please show your full configuration: eslintrc.json

What did you do? Please include the actual source code causing the issue.

Additionally, in another file, this perfectly valid template string:

Reports this linter error:

What did you expect to happen?
Shouldn’t have seen linter errors.

What actually happened? Please include the actual, raw output from ESLint.
No other errors are reported for these lines or files.

The text was updated successfully, but these errors were encountered:

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Posted By: Anonymous
<template>
<label>Firstname: </label><input type="text" v-model="user.firstName">
    <br/>
    <label>Lastname: </label><input type="text" v-model="user.lastName">
    <h3>{{fullName}}</h3>
</template>

<script>
export default {
    name: 'homepage',
    data() {
      return {
        title: 'Hello',
        user: {
          firstName: 'name',
          lastName: 'surname',
        },
        showName: false,
        items: [
          {
            title: 'Item one',
          },
          {
            title: 'Item two',
          },
          {
            title: 'Item three',
          },
        ],
      };
    },
    computed: {
      fullName() {
        return this.user.firstName + ' ' + this.user.lastName;
      },
    },
  };
</script>

I am trying to return a string value in fullName() function but when I add + ' ' + ...., I get Unexpected string concatenation(prefer-template) error. If I just return this.user.firstName; it works. How can I return this.user.firstName + ' ' + this.user.lastName;?

Solution

This is a lint error. There is nothing inherently wrong from a JavaScript perspective with this.user.firstName + ' ' + this.user.lastName;. However your linter is setup to show an error when it finds string concatenation. Simply use a template string instead, as it is now the preferred method.

`${this.user.firstName} ${this.user.lastName}`

If you would prefer to use concatenation. Lookup how to modify your linters rule, for example here is how to do it for eslint (which I believe you are using).

Answered By: Anonymous

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tags: JavaScript  Vue  ES6  

The error is as follows:

Reason: ESLint recommends using ES6 Template String to splice strings, but not+number.

Solution:

`I am the string part, ${I am the parameter part}, I am the string part`

Official document: https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/template_strings

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