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Snippets: AssemblyScript

These are the AssemblyScript snippets the console offers in a .as module. A module computes and reaches nothing: a script imports it and hands it copies of its arguments.

Sum a list of numbers

An exported function a script imports. A module is handed copies of its arguments and reaches nothing else, so it only computes.

export function sum(values: Float64Array): f64 {
    let total: f64 = 0;
    for (let i = 0; i < values.length; i++) total += unchecked(values[i]);
    return total;
}

Hash a text

FNV-1a over a string, a fast way to compare large texts. Import it in a script with import { fnv1a } from “./hash.as”.

export function fnv1a(text: string): u32 {
    let hash: u32 = 0x811c9dc5;
    for (let i = 0; i < text.length; i++) {
        hash ^= <u32>text.charCodeAt(i);
        hash *= 0x01000193;
    }
    return hash;
}

Score how alike two texts are

The edit distance between two strings, for finding near-duplicate summaries. Linear memory, no allocations in the loop.

export function distance(a: string, b: string): i32 {
    const row = new Int32Array(b.length + 1);
    for (let j = 0; j <= b.length; j++) row[j] = j;
    for (let i = 1; i <= a.length; i++) {
        let previous = row[0];
        row[0] = i;
        for (let j = 1; j <= b.length; j++) {
            const current = row[j];
            const cost = a.charCodeAt(i - 1) == b.charCodeAt(j - 1) ? 0 : 1;
            row[j] = min(min(row[j] + 1, row[j - 1] + 1), previous + cost);
            previous = current;
        }
    }
    return row[b.length];
}

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