9 lines
272 B
JavaScript
9 lines
272 B
JavaScript
function makeMultiplier(x=1) {
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return (y=1) => x * y;
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}
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assert.equal(makeMultiplier()(), 1);
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assert.equal(makeMultiplier(2)(3), 6);
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assert.deepEqual([1, 2, 3].map(makeMultiplier(2)), [2, 4, 6]);
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assert.deepEqual([undefined, null, 0].map(makeMultiplier(2)), [2, 0, 0]);
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