freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/es6/create-strings-using-template-literals.md

---
id: 587d7b8a367417b2b2512b4e
title: Create Strings using Template Literals
challengeType: 1
forumTopicId: 301200
dashedName: create-strings-using-template-literals
---

# --description--

A new feature of ES6 is the <dfn>template literal</dfn>. This is a special type of string that makes creating complex strings easier.

Template literals allow you to create multi-line strings and to use string interpolation features to create strings.

Consider the code below:

```js
const person = {
  name: "Zodiac Hasbro",
  age: 56
};

// Template literal with multi-line and string interpolation
const greeting = `Hello, my name is ${person.name}!
I am ${person.age} years old.`;

console.log(greeting); // prints
// Hello, my name is Zodiac Hasbro!
// I am 56 years old.

```

A lot of things happened there. Firstly, the example uses backticks (`` ` ``), not quotes (`'` or `"`), to wrap the string. Secondly, notice that the string is multi-line, both in the code and the output. This saves inserting `\n` within strings. The `${variable}` syntax used above is a placeholder. Basically, you won't have to use concatenation with the `+` operator anymore. To add variables to strings, you just drop the variable in a template string and wrap it with `${` and `}`. Similarly, you can include other expressions in your string literal, for example `${a + b}`. This new way of creating strings gives you more flexibility to create robust strings.

# --instructions--

Use template literal syntax with backticks to create an array of list element (`li`) strings. Each list element's text should be one of the array elements from the `failure` property on the `result` object and have a `class` attribute with the value `text-warning`. The `makeList` function should return the array of list item strings.

Use an iterator method (any kind of loop) to get the desired output (shown below).

```js
[
  '<li class="text-warning">no-var</li>',
  '<li class="text-warning">var-on-top</li>',
  '<li class="text-warning">linebreak</li>'
]
```

# --hints--

`failuresList` should be an array containing `result failure` messages.

```js
assert(
  typeof makeList(result.failure) === 'object' && failuresList.length === 3
);
```

`failuresList` should be equal to the specified output.

```js
assert(
  makeList(result.failure).every(
    (v, i) =>
      v === `<li class="text-warning">${result.failure[i]}</li>` ||
      v === `<li class='text-warning'>${result.failure[i]}</li>`
  )
);
```

Template strings and expression interpolation should be used.

```js
(getUserInput) => assert(getUserInput('index').match(/(`.*\${.*}.*`)/));
```

An iterator should be used.

```js
(getUserInput) =>
  assert(getUserInput('index').match(/for|map|reduce|forEach|while/));
```

# --seed--

## --seed-contents--

```js
const result = {
  success: ["max-length", "no-amd", "prefer-arrow-functions"],
  failure: ["no-var", "var-on-top", "linebreak"],
  skipped: ["no-extra-semi", "no-dup-keys"]
};
function makeList(arr) {
  // Only change code below this line
  const failureItems = [];
  // Only change code above this line

  return failureItems;
}

const failuresList = makeList(result.failure);
```

# --solutions--

```js
const result = {
  success: ["max-length", "no-amd", "prefer-arrow-functions"],
  failure: ["no-var", "var-on-top", "linebreak"],
  skipped: ["no-extra-semi", "no-dup-keys"]
};
function makeList(arr) {
  return arr.map(val => `<li class="text-warning">${val}</li>`);
}

const failuresList = makeList(result.failure);
```