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Chris Tate
320a97bf3b
util.diff([], []) with two arrays read one element past its trace row while backtracking. Node's myersDiff answers undefined for two empty sequences, and util.diff's ArrayPrototypeReverse throws "Cannot convert undefined or null to object"; scr_util_diff now throws the same TypeError before it allocates the trace.
15 lines
956 B
JavaScript
15 lines
956 B
JavaScript
// util.diff over strings (one entry per UTF-16 code unit, astral pairs as
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// two) and arrays of strings: Node's Myers diff entries in order, identical
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// values answering [] before validation, and ERR_INVALID_ARG_TYPE naming
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// the argument or the array element.
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const util = require("util");
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const show = (a, e) => {
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try { console.log(JSON.stringify(util.diff(a, e))); } catch (err) { console.log(err.name, err.code, err.message); }
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};
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show("abc", "abd"); show("kitten", "sitting"); show("", "x"); show("same", "same"); show("", "");
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show(["a", "b", "c"], ["a", "c", "d"]); show(["x"], []); show([], ["y", "z"]); show([], []);
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const arr = ["p"]; show(arr, arr); show(1, 1); show(1, 2); show("a", 2); show(["a", 1], ["a"]); show(["a"], [, "b"]);
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show(null, "x"); show("x", undefined); show("héllo😀", "hello😀"); show({}, "x");
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show("the quick brown fox", "the quack brown box");
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console.log(util.diff(["line 1", "line 2"], ["line 1", "line 3"]));
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