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Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 16 |
1 files changed, 15 insertions, 1 deletions
@@ -154,9 +154,14 @@ through numeric operations, or explicitely, e.g. by invoking functions such as Variable names must start with a letter or an underscore and may only contain the characters `A`..`Z`, `a`..`z`, `0`..`9` or `_`. By prefixing a variable -name with the keyword `let`, it is declared in the local function scope only +name with the keyword `let`, it is declared in the local block scope only and not visible outside anymore. +Variables may also be declared using the `const` keyword. Such variables follow +the same scoping rules as `let` declared ones but they cannot be modified after +they have been declared. Any attempt to do so will result in a syntax error +during compilation. + ```javascript {% @@ -172,6 +177,15 @@ and not visible outside anymore. print(a, "\n"); // outputs "2" print(b, "\n"); // outputs nothing + const c = 3; + print(c, "\n"); // outputs "3" + + c = 4; // raises syntax error + c++; // raises syntax error + + const d; // raises syntax error, const variables must + // be initialized at declaration time + %} ``` |