parent
8412c51b89
commit
2b3255f390
@ -0,0 +1,65 @@
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const emptyArray = [];
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const arrayOfSixElements = [1, 2, 3, 4, 5, 6, 7];
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console.log(arrayOfSixElements.length);
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console.log(
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arrayOfSixElements[0],
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arrayOfSixElements[arrayOfSixElements.length - 1],
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arrayOfSixElements[Math.floor(arrayOfSixElements.length / 2)],
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);
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const mixedDataTypes = [1, 2, 'string', true, 'Alex', 'Sara'];
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console.log(mixedDataTypes.length);
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let itCompanies = [
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'Facebook',
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'Google',
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'Microsoft',
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'Apple',
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'IBM',
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'Oracle',
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'Amazon',
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];
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console.log(itCompanies);
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console.log(itCompanies.length);
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console.log(
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itCompanies[0],
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itCompanies[itCompanies.length - 1],
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itCompanies[Math.floor(itCompanies.length / 2)],
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);
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itCompanies.forEach((company) => console.log(company));
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itCompanies = itCompanies.map((company) => company.toUpperCase());
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itCompanies.forEach((company) => console.log(company));
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itCompanies = itCompanies.map(
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(company) => company.slice(0, 1) + company.slice(1).toLowerCase(),
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);
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console.log(
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`${itCompanies.slice(0, 6).join(',')} and ${
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itCompanies[itCompanies.length - 1]
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} big IT companies`,
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);
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const companyInArray =
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itCompanies.indexOf('Apple') !== -1 ? 'Apple' : 'not found';
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console.log(companyInArray);
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const filterArray = [];
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for (company of itCompanies) {
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const o = company.match(/o/gi);
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if (o && o.length == 2) {
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filterArray.push(company);
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}
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}
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console.log(filterArray);
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console.log(itCompanies.sort());
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console.log(itCompanies.reverse());
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console.log(itCompanies.slice(3));
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console.log(itCompanies.slice(0, 4));
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console.log(
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itCompanies.slice(
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Math.floor(itCompanies.length / 2),
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Math.floor(itCompanies.length / 2) + 1,
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),
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);
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itCompanies.shift();
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console.log(itCompanies);
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console.log(itCompanies.slice((Math.floor(itCompanies.length / 2), 1)));
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itCompanies.pop();
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itCompanies.length = 0;
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