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babelã¸Optional ChainingãŒè¿½åŠ ã•ã‚Œã‚‹ - æŠ€è¡“æŽ¢ã—

Optional Chaining github.com // before const fooInput = myForm.querySelector('input[name=foo]'); const fooValue = fooInput ? fooInput.value : undefined; // after const fooValue = myForm.querySelector('input[name=foo]')?.value; const obj = { foo: { bar: { baz: 42 } } }; obj?.foo?.bar?.baz; // 42 obj?.qux?.baz; // undefined obj?.foo.bar.qux?.(); // undefined function test() { return 42; } test?.();

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WebSequenceDiagrams - Draw sequence diagrams online in seconds

Draw sequence diagrams in seconds using this free online tool.

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JavaScript(ES2015&React)ã§ç”»åƒã‚’æ‰±ã†ï¼šãƒªã‚µã‚¤ã‚ºã¨ãƒ—ãƒ¬ãƒ“ãƒ¥ãƒ¼è¡¨ç¤º - dackdive's blog

babelã¸Optional ChainingãŒè¿½åŠ ã•ã‚Œã‚‹ - æŠ€è¡“æŽ¢ã—

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WebSequenceDiagrams - Draw sequence diagrams online in seconds

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