21 lines
290 B
Markdown
21 lines
290 B
Markdown
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```js run demo solution
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let calculator = {
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sum() {
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return this.a + this.b;
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},
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mul() {
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return this.a * this.b;
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},
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read() {
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this.a = +prompt('a?', 0);
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this.b = +prompt('b?', 0);
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}
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};
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calculator.read();
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alert( calculator.sum() );
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alert( calculator.mul() );
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```
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