| 1 | const array = require('extra-array');
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| 2 |
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| 3 | var x = [1, 2, 3, 4];
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| 4 | array.isSubsequence(x, [2, 4]);
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| 5 |
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| 6 | array.isSubsequence(x, [-2, -4]);
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| 7 |
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| 8 | array.isSubsequence(x, [-2, -4], (a, b) => Math.abs(a) - Math.abs(b));
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| 9 |
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| 10 | array.isSubsequence(x, [-2, -4], null, v => Math.abs(v));
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