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JavaScript var VS const VS let VS (silencio)
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| <!doctype html> | |
| <script src="variavel-const-let-a.js"></script> | |
| <script src="variavel-const-let-b.js"></script> | |
| <title>Este é um código HTML5 válido https://validator.w3.org/ (mas não é acessível)</title> | |
| <!-- | |
| Navegador imprime: | |
| variavelConstA: ConstA | variavelLetA: LetA | |
| --> |
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| <!doctype html> | |
| <script src="variavel-ao-estilo-ponto-e-virgula.js"></script> | |
| <script src="variavel-ao-estilo-ponto-e-virgula-funciona-aqui-tambem.js"></script> | |
| <title>Este é um código HTML5 válido https://validator.w3.org/ (mas não é acessível)</title> | |
| <!-- | |
| Console Log: | |
| 123 variavel-ao-estilo-ponto-e-virgula.js:2 | |
| 124 variavel-ao-estilo-ponto-e-virgula-funciona-aqui-tambem.js:2 | |
| Navegador: | |
| 123 | |
| 124 | |
| --> |
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| document.write(variavel + "<br>"); | |
| variavel = variavel + 1; | |
| console.log(variavel); | |
| document.write(variavel); |
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| /* | |
| https://www.facebook.com/photo.php?fbid=1462524780465665&set=a.833662720018544.1073741831.100001244705769&type=3 | |
| ⸮ Sobre a polêmica do que usar no #JavaScript entre var, let ou const: análogo ao uso de ponto-vírgula, | |
| também é possível escolher NENHUMA das três opções pra definir variáveis | |
| 👨👁🌎🔥 | |
| */ | |
| variavel = 123; | |
| console.log(variavel); | |
| // fititnt@bravo:~$ cat variavel-ao-estilo-ponto-e-virgula.js | |
| // variavel = 123; | |
| // console.log(variavel); | |
| // fititnt@bravo:~$ node variavel-ao-estilo-ponto-e-virgula.js | |
| // 123 | |
| // fititnt@bravo:~$ node -v | |
| // v7.9.0 |
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| const variavelConstA = "ConstA"; | |
| let variavelLetA = "LetA"; |
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| console.log(variavelConstA); | |
| console.log(variavelLetA); | |
| document.write("variavelConstA: " + variavelConstA + " | " ); | |
| document.write("variavelLetA: " + variavelLetA); |
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