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Strings#153
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6 changes: 3 additions & 3 deletions1-js/05-data-types/03-string/1-ucfirst/_js.view/solution.js
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@@ -1,5 +1,5 @@ | ||
functionvelkéPrvníPísmeno(řetězec) { | ||
if (!řetězec) returnřetězec; | ||
returnřetězec[0].toUpperCase() +řetězec.slice(1); | ||
} |
10 changes: 5 additions & 5 deletions1-js/05-data-types/03-string/1-ucfirst/_js.view/test.js
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@@ -1,9 +1,9 @@ | ||
describe("velkéPrvníPísmeno", function() { | ||
it('První symbol převede na velké písmeno', function() { | ||
assert.strictEqual(velkéPrvníPísmeno("jan"), "Jan"); | ||
}); | ||
it("Nespadne na prázdném řetězci", function() { | ||
assert.strictEqual(velkéPrvníPísmeno(""), ""); | ||
}); | ||
}); |
18 changes: 9 additions & 9 deletions1-js/05-data-types/03-string/1-ucfirst/solution.md
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Nemůžeme „nahradit“ první znak, protože řetězce v JavaScriptu jsou neměnné. | ||
Můžeme však vytvořit z existujícího řetězce nový, který bude mít první znak převedený na velké písmeno: | ||
```js | ||
letnovýŘetězec =řetězec[0].toUpperCase() +řetězec.slice(1); | ||
``` | ||
Je tady však malý problém. Jestliže `řetězec` je prázdný, pak `řetězec[0]`je `undefined`,a protože `undefined`nemá metodu`toUpperCase()`, dostaneme chybu. | ||
Nejjednodušší způsob, jaktovyřešit, je přidattestna prázdný řetězec, například takto: | ||
```js run demo | ||
functionvelkéPrvníPísmeno(řetězec) { | ||
if (!řetězec) returnřetězec; | ||
returnřetězec[0].toUpperCase() +řetězec.slice(1); | ||
} | ||
alert(velkéPrvníPísmeno("jan") ); //Jan | ||
``` |
6 changes: 3 additions & 3 deletions1-js/05-data-types/03-string/1-ucfirst/task.md
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6 changes: 3 additions & 3 deletions1-js/05-data-types/03-string/2-check-spam/_js.view/solution.js
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functionověřSpam(řetězec) { | ||
letřetězecMalýmiPísmeny =řetězec.toLowerCase(); | ||
returnřetězecMalýmiPísmeny.includes('viagra') ||řetězecMalýmiPísmeny.includes('xxx'); | ||
} |
14 changes: 7 additions & 7 deletions1-js/05-data-types/03-string/2-check-spam/_js.view/test.js
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describe("ověřSpam", function() { | ||
it('najde spamve "levná ViAgRAzde"', function() { | ||
assert.isTrue(ověřSpam('levná ViAgRAzde')); | ||
}); | ||
it('najde spamve "zdarma xxxxx"', function() { | ||
assert.isTrue(ověřSpam('zdarma xxxxx')); | ||
}); | ||
it('není spamv "nevinný králíček"', function() { | ||
assert.isFalse(ověřSpam('nevinný králíček')); | ||
}); | ||
}); |
14 changes: 7 additions & 7 deletions1-js/05-data-types/03-string/2-check-spam/solution.md
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@@ -1,14 +1,14 @@ | ||
Aby hledání nerozlišovalo malá a velká písmena, převedeme řetězec na malá písmena a pak budeme hledat: | ||
```js run demo | ||
functionověřSpam(řetězec) { | ||
letřetězecMalýmiPísmeny =řetězec.toLowerCase(); | ||
returnřetězecMalýmiPísmeny.includes('viagra') ||řetězecMalýmiPísmeny.includes('xxx'); | ||
} | ||
alert(ověřSpam('levná ViAgRAzde') ); | ||
alert(ověřSpam('zdarma xxxxx') ); | ||
alert(ověřSpam("nevinný králíček") ); | ||
``` | ||
12 changes: 6 additions & 6 deletions1-js/05-data-types/03-string/2-check-spam/task.md
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6 changes: 3 additions & 3 deletions1-js/05-data-types/03-string/3-truncate/_js.view/solution.js
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@@ -1,4 +1,4 @@ | ||
functionzkrať(řetězec, maxDélka) { | ||
return (řetězec.length >maxDélka) ? | ||
řetězec.slice(0,maxDélka - 1) + '…' :řetězec; | ||
} |
14 changes: 7 additions & 7 deletions1-js/05-data-types/03-string/3-truncate/_js.view/test.js
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10 changes: 5 additions & 5 deletions1-js/05-data-types/03-string/3-truncate/solution.md
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Maximální délka musí být `maxDélka`,takže musíme odříznout řetězec kratší o jeden znak, abychom získali místo pro výpustku. | ||
Všimněte si, že pro výpustku existuje v Unicodejediný znak. Nejsou to tři tečky za sebou. | ||
```js run demo | ||
functionzkrať(řetězec, maxDélka) { | ||
return (řetězec.length >maxDélka) ? | ||
řetězec.slice(0,maxDélka - 1) + '…' :řetězec; | ||
} | ||
``` |
12 changes: 6 additions & 6 deletions1-js/05-data-types/03-string/3-truncate/task.md
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4 changes: 2 additions & 2 deletions1-js/05-data-types/03-string/4-extract-currency/_js.view/solution.js
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@@ -1,3 +1,3 @@ | ||
functionvyjmiČástku(řetězec) { | ||
return +řetězec.slice(1); | ||
} |
6 changes: 3 additions & 3 deletions1-js/05-data-types/03-string/4-extract-currency/_js.view/test.js
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10 changes: 5 additions & 5 deletions1-js/05-data-types/03-string/4-extract-currency/task.md
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