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Chris Tate
c92fdceedd
* Support static string at and codePointAt * Update static at diagnostics and island contracts
24 lines
1.3 KiB
JavaScript
24 lines
1.3 KiB
JavaScript
const word = "café";
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console.log(word.at(0), word.at(-1), word.at(-5), word.at(4));
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console.log("abcdef".at(-1.9), "abcdef".at(1.9), "abcdef".at(-Infinity), "abcdef".at(NaN));
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console.log("abc".at("1"), "abc".at(false), "abc".at(null), "abc".at(undefined));
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console.log("abc".at([1]), "abc".at([]), "abc".at(function () {}));
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const astral = "A😀B";
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console.log(astral.codePointAt(0), astral.codePointAt(1), astral.codePointAt(2), astral.codePointAt(3), astral.codePointAt(4));
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console.log(astral.codePointAt(-1), astral.codePointAt(Infinity), astral.codePointAt(NaN));
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console.log(astral.codePointAt("1.9"), astral.codePointAt([3]), astral.codePointAt([]));
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console.log(String.prototype.at.call(12345, -1), String.prototype.codePointAt.call(true, 0));
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let order = "";
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function receiver() { order += "r"; return "abc"; }
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function argument() { order += "a"; return { valueOf() { order += "v"; return 1.8; } }; }
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console.log(receiver().at(argument()), order);
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order = "";
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console.log(String.prototype.codePointAt.call(receiver(), argument()), order);
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order = "";
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function touched() { order += "x"; return 0; }
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try { String.prototype.at.call(undefined, touched()); } catch (error) { console.log(error.name, error.message, order); }
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try { String.prototype.codePointAt.call(null, touched()); } catch (error) { console.log(error.name, error.message, order); }
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