.github
api-server
client
config
curriculum
challenges
_meta
arabic
chinese
english
portuguese
russian
01-responsive-web-design
02-javascript-algorithms-and-data-structures
basic-algorithm-scripting
basic-data-structures
basic-javascript
access-array-data-with-indexes.russian.md
access-multi-dimensional-arrays-with-indexes.russian.md
accessing-nested-arrays.russian.md
accessing-nested-objects.russian.md
accessing-object-properties-with-bracket-notation.russian.md
accessing-object-properties-with-dot-notation.russian.md
accessing-object-properties-with-variables.russian.md
add-new-properties-to-a-javascript-object.russian.md
add-two-numbers-with-javascript.russian.md
adding-a-default-option-in-switch-statements.russian.md
appending-variables-to-strings.russian.md
assignment-with-a-returned-value.russian.md
build-javascript-objects.russian.md
chaining-if-else-statements.russian.md
comment-your-javascript-code.russian.md
comparison-with-the-equality-operator.russian.md
comparison-with-the-greater-than-operator.russian.md
comparison-with-the-greater-than-or-equal-to-operator.russian.md
comparison-with-the-inequality-operator.russian.md
comparison-with-the-less-than-operator.russian.md
comparison-with-the-less-than-or-equal-to-operator.russian.md
comparison-with-the-strict-equality-operator.russian.md
comparison-with-the-strict-inequality-operator.russian.md
comparisons-with-the-logical-and-operator.russian.md
comparisons-with-the-logical-or-operator.russian.md
compound-assignment-with-augmented-addition.russian.md
compound-assignment-with-augmented-division.russian.md
compound-assignment-with-augmented-multiplication.russian.md
compound-assignment-with-augmented-subtraction.russian.md
concatenating-strings-with-plus-operator.russian.md
concatenating-strings-with-the-plus-equals-operator.russian.md
constructing-strings-with-variables.russian.md
count-backwards-with-a-for-loop.russian.md
counting-cards.russian.md
create-decimal-numbers-with-javascript.russian.md
declare-javascript-variables.russian.md
declare-string-variables.russian.md
decrement-a-number-with-javascript.russian.md
delete-properties-from-a-javascript-object.russian.md
divide-one-decimal-by-another-with-javascript.russian.md
divide-one-number-by-another-with-javascript.russian.md
escape-sequences-in-strings.russian.md
escaping-literal-quotes-in-strings.russian.md
find-the-length-of-a-string.russian.md
finding-a-remainder-in-javascript.russian.md
generate-random-fractions-with-javascript.russian.md
generate-random-whole-numbers-with-javascript.russian.md
generate-random-whole-numbers-within-a-range.russian.md
global-scope-and-functions.russian.md
global-vs.-local-scope-in-functions.russian.md
golf-code.russian.md
increment-a-number-with-javascript.russian.md
initializing-variables-with-the-assignment-operator.russian.md
introducing-else-if-statements.russian.md
introducing-else-statements.russian.md
iterate-odd-numbers-with-a-for-loop.russian.md
iterate-through-an-array-with-a-for-loop.russian.md
iterate-with-javascript-do...while-loops.russian.md
iterate-with-javascript-for-loops.russian.md
iterate-with-javascript-while-loops.russian.md
local-scope-and-functions.russian.md
logical-order-in-if-else-statements.russian.md
manipulate-arrays-with-pop.russian.md
manipulate-arrays-with-push.russian.md
manipulate-arrays-with-shift.russian.md
manipulate-arrays-with-unshift.russian.md
manipulating-complex-objects.russian.md
modify-array-data-with-indexes.russian.md
multiple-identical-options-in-switch-statements.russian.md
multiply-two-decimals-with-javascript.russian.md
multiply-two-numbers-with-javascript.russian.md
nest-one-array-within-another-array.russian.md
nesting-for-loops.russian.md
passing-values-to-functions-with-arguments.russian.md
practice-comparing-different-values.russian.md
profile-lookup.russian.md
quoting-strings-with-single-quotes.russian.md
record-collection.russian.md
replacing-if-else-chains-with-switch.russian.md
return-a-value-from-a-function-with-return.russian.md
return-early-pattern-for-functions.russian.md
returning-boolean-values-from-functions.russian.md
selecting-from-many-options-with-switch-statements.russian.md
shopping-list.russian.md
stand-in-line.russian.md
store-multiple-values-in-one-variable-using-javascript-arrays.russian.md
storing-values-with-the-assignment-operator.russian.md
subtract-one-number-from-another-with-javascript.russian.md
testing-objects-for-properties.russian.md
understand-string-immutability.russian.md
understanding-boolean-values.russian.md
understanding-case-sensitivity-in-variables.russian.md
understanding-undefined-value-returned-from-a-function.russian.md
understanding-uninitialized-variables.russian.md
updating-object-properties.russian.md
use-bracket-notation-to-find-the-first-character-in-a-string.russian.md
use-bracket-notation-to-find-the-last-character-in-a-string.russian.md
use-bracket-notation-to-find-the-nth-character-in-a-string.russian.md
use-bracket-notation-to-find-the-nth-to-last-character-in-a-string.russian.md
use-conditional-logic-with-if-statements.russian.md
use-multiple-conditional-ternary-operators.russian.md
use-the-conditional-ternary-operator.russian.md
use-the-parseint-function-with-a-radix.russian.md
use-the-parseint-function.russian.md
using-objects-for-lookups.russian.md
word-blanks.russian.md
write-reusable-javascript-with-functions.russian.md
debugging
es6
functional-programming
intermediate-algorithm-scripting
javascript-algorithms-and-data-structures-projects
object-oriented-programming
regular-expressions
03-front-end-libraries
04-data-visualization
06-information-security-and-quality-assurance
08-coding-interview-prep
09-certificates
spanish
formattingConversion
math-challenges
requiresTests
schema
test
.babelrc
.editorconfig
.npmignore
.travis.yml
CHANGELOG.md
LICENSE.md
commitizen.config.js
commitlint.config.js
create-challenge-bundle.js
getChallenges.js
gulpfile.js
index.js
lib.js
md-translation.js
package-entry.js
package-lock.json
package.json
utils.js
docs
guide
mock-guide
tools
.editorconfig
.eslintignore
.eslintrc.json
.gitattributes
.gitignore
.node-inspectorrc
.prettierrc
.snyk
.travis.yml
.vcmrc
CODE_OF_CONDUCT.md
CONTRIBUTING.md
Dockerfile.tests
LICENSE.md
README.french.md
README.italian.md
README.md
change_volumes_owner.sh
docker-compose-shared.yml
docker-compose.tests.yml
docker-compose.yml
lerna.json
netlify.toml
package-lock.json
package.json
sample.env
71 lines
2.6 KiB
Markdown
71 lines
2.6 KiB
Markdown
---
|
||
id: bd7123c9c549eddfaeb5bdef
|
||
title: Use Bracket Notation to Find the First Character in a String
|
||
challengeType: 1
|
||
videoUrl: ''
|
||
localeTitle: Используйте условное обозначение скобки для поиска первого символа в строке
|
||
---
|
||
|
||
## Description
|
||
<section id="description"> <code>Bracket notation</code> - это способ получить символ с определенным <code>index</code> внутри строки. Большинство современных языков программирования, например JavaScript, не начинаются с 1, как люди. Они начинаются с 0. Это называется индексацией на <dfn>основе нуля</dfn> . Например, символ с индексом 0 в слове «Чарльз» - «С». Поэтому, если <code>var firstName = "Charles"</code> , вы можете получить значение первой буквы строки, используя <code>firstName[0]</code> . </section>
|
||
|
||
## Instructions
|
||
<section id="instructions"> Используйте <dfn>условное обозначение</dfn> в <dfn>скобках,</dfn> чтобы найти первый символ в переменной <code>lastName</code> и назначить его <code>firstLetterOfLastName</code> . <strong>намек</strong> <br> Попробуйте взглянуть на объявление <code>firstLetterOfFirstName</code> если вы застряли. </section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: В переменной <code>firstLetterOfLastName</code> должно быть значение <code>L</code>
|
||
testString: 'assert(firstLetterOfLastName === "L", "The <code>firstLetterOfLastName</code> variable should have the value of <code>L</code>.");'
|
||
- text: Вы должны использовать условное обозначение.
|
||
testString: 'assert(code.match(/firstLetterOfLastName\s*?=\s*?lastName\[.*?\]/), "You should use bracket notation.");'
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='js-seed'>
|
||
|
||
```js
|
||
// Example
|
||
var firstLetterOfFirstName = "";
|
||
var firstName = "Ada";
|
||
|
||
firstLetterOfFirstName = firstName[0];
|
||
|
||
// Setup
|
||
var firstLetterOfLastName = "";
|
||
var lastName = "Lovelace";
|
||
|
||
// Only change code below this line
|
||
firstLetterOfLastName = lastName;
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
### After Test
|
||
<div id='js-teardown'>
|
||
|
||
```js
|
||
console.info('after the test');
|
||
```
|
||
|
||
</div>
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
</section>
|