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Object.freeze
Object.freeze allows us to disable object mutation.1
let movie1 = {
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name: 'Star Wars',
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episode: 7
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};
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let movie2 = Object.freeze(Object.assign({}, movie1));
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movie2.episode = 8; // fails silently in non-strict mode,
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// throws error in strict mode
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console.log(movie1.episode); // writes 7
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console.log(movie2.episode); // writes 7
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