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Edit documentation.

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This commit is contained in:
Stephen Chung
2020-06-22 00:03:45 +08:00
parent 7cc1a3f5dc
commit d728ac6758
37 changed files with 386 additions and 147 deletions
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29
doc/src/language/for.md
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@@ -5,50 +5,53 @@
Iterating through a range or an [array] is provided by the `for` ... `in` loop.
Like C, `continue` can be used to skip to the next iteration, by-passing all following statements;
`break` can be used to break out of the loop unconditionally.
```rust
// Iterate through string, yielding characters
let s = "hello, world!";
for ch in s {
if ch > 'z' { continue; } // skip to the next iteration
if ch > 'z' { continue; } // skip to the next iteration
print(ch);
if x == '@' { break; } // break out of for loop
if x == '@' { break; } // break out of for loop
}
// Iterate through array
let array = [1, 3, 5, 7, 9, 42];
for x in array {
if x > 10 { continue; } // skip to the next iteration
if x > 10 { continue; } // skip to the next iteration
print(x);
if x == 42 { break; } // break out of for loop
if x == 42 { break; } // break out of for loop
}
// The 'range' function allows iterating from first to last-1
for x in range(0, 50) {
if x > 10 { continue; } // skip to the next iteration
if x > 10 { continue; } // skip to the next iteration
print(x);
if x == 42 { break; } // break out of for loop
if x == 42 { break; } // break out of for loop
}
// The 'range' function also takes a step
for x in range(0, 50, 3) { // step by 3
if x > 10 { continue; } // skip to the next iteration
for x in range(0, 50, 3) { // step by 3
if x > 10 { continue; } // skip to the next iteration
print(x);
if x == 42 { break; } // break out of for loop
if x == 42 { break; } // break out of for loop
}
// Iterate through object map
let map = #{a:1, b:3, c:5, d:7, e:9};
// Property names are returned in random order
// Property names are returned in unsorted, random order
for x in keys(map) {
if x > 10 { continue; } // skip to the next iteration
if x > 10 { continue; } // skip to the next iteration
print(x);
if x == 42 { break; } // break out of for loop
if x == 42 { break; } // break out of for loop
}
// Property values are returned in random order
// Property values are returned in unsorted, random order
for val in values(map) {
print(val);
}