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std/fmt ​

String formatting and padding utilities.

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from "std/fmt" import { fmt1, fmt2, join, padLeft, zeroPad }

Example ​

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let msg = fmt2("Hello, {}! You have {} messages.", "Alice", "3")
// "Hello, Alice! You have 3 messages."
let id = zeroPad(42, 5)          // "00042"
let row = padLeft("7", 3, 32)     // "  7" (32 is ' ')
let csv = join(["a", "b"], ", ")  // "a, b"

API reference ​

fmt1 ​

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pub fn fmt1(template: &string, a: &string): string

Replace the first {} with a.

fmt2 ​

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pub fn fmt2(template: &string, a: &string, b: &string): string

Replace the first two {} with a and b.

fmt3 ​

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pub fn fmt3(template: &string, a: &string, b: &string, c: &string): string

Replace the first three {} with a, b, and c.

fmt4 ​

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pub fn fmt4(template: &string, a: &string, b: &string, c: &string, d: &string): string

Replace the first four {} with a, b, c, and d.

join ​

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pub fn join(parts: &Vec<string>, sep: &string): string

Join a Vec<string> with a separator.

padLeft ​

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pub fn padLeft(s: &string, width: i64, ch: u8): string

Left-pad a string to a minimum width.

padRight ​

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pub fn padRight(s: &string, width: i64, ch: u8): string

Right-pad a string to a minimum width.

zeroPad ​

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pub fn zeroPad(n: i64, width: i64): string

Zero-pad an integer to a minimum width.