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Add delete operator example #6

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merged 3 commits into from
Sep 30, 2017
+31 −0
Merged

Add delete operator example #6

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db0599f
Added delete operator example
Sep 29, 2017
e8ceeaf
Minor improvement
Sep 30, 2017
439c9e9
Minor improvements #2
Sep 30, 2017
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31 changes: 31 additions & 0 deletions JavaScript/7-delete.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,31 @@
'use strict';

const org = 'HowProgrammingWorks';

// delete org; // Raises SyntaxError in strict mode

const country = {
name: 'Chile',
ruler: 'Augusto Pinochet',
born: 1915,
alive: false
};

delete country.ruler;
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console.dir({ country });

delete country.born;
delete country.population;
console.dir({ country });

const currencies = ['BTC', 'EUR', 'UAH', 'USD'];

console.log('currencies[1]:', currencies[1], 1 in currencies);
console.log('currencies[2]:', currencies[2], 2 in currencies);

delete currencies[1];
currencies[2] = undefined;
console.dir({ currencies });

console.log('currencies[1]:', currencies[1], 1 in currencies);
console.log('currencies[2]:', currencies[2], 2 in currencies);