image-in-browser/lib/src/common/map-utils.js

Package for encoding / decoding images, transforming images, applying filters, drawing primitives on images on the client side (no need for server Node.js)

export class MapUtils {
    static putIfAbsent(map, key, ifAbsent) {
        if (map.has(key)) {
            return map.get(key);
        }
        else {
            const newValue = ifAbsent();
            map.set(key, newValue);
            return newValue;
        }
    }
}
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