@kahi-ui/framework/util/functional.js

Straight-forward Svelte UI for the Web

export function chunk(array, length) {
    return array.reduce((accum, date, index) => {
        const chunk_index = Math.floor(index / length);
        if (!accum[chunk_index])
            accum[chunk_index] = [];
        accum[chunk_index].push(date);
        return accum;
    }, []);
}
export function debounce(func, duration = 0) {
    let identifier;
    return (...args) => {
        if (identifier !== undefined) {
            clearTimeout(identifier);
            identifier = undefined;
        }
        // @ts-ignore - HACK: NodeJS doesn't follow spec
        identifier = setTimeout(() => func(...args), duration);
    };
}
export function defaultopt(value, default_value) {
    for (const key in value) {
        if (typeof value[key] !== "undefined")
            return value;
    }
    return default_value;
}
export function fill(generator, length) {
    return new Array(length).fill(null).map((_, index) => generator(index));
}
export function pick(map, keys) {
    const lookup = new Set(keys);
    const entries = Array.from(map.entries()).filter(([key, value], index) => lookup.has(key));
    return new Map(entries);
}
export function range(minimum, maximum) {
    return new Array(maximum - minimum + 1).fill(null).map((_, index) => minimum + index);
}
export function throttle(func, duration = 0) {
    let previous_call = Number.MIN_SAFE_INTEGER;
    return (...args) => {
        const current_call = Date.now();
        if (current_call - previous_call >= duration) {
            func(...args);
            previous_call = current_call;
        }
    };
}