opendash/dist/helper/equals.js

open.DASH data visualization framework

// from https://github.com/lukeed/dequal
export function equals(a, b) {
    var constructor, len;
    if (a === b) {
        return true;
    }
    if (a && b && (constructor = a.constructor) === b.constructor) {
        if (constructor === Date) {
            return a.getTime() === b.getTime();
        }
        if (constructor === RegExp) {
            return a.toString() === b.toString();
        }
        if (constructor === Array && (len = a.length) === b.length) {
            while (len-- && equals(a[len], b[len]))
                ;
            return len === -1;
        }
        if (constructor === Object) {
            if (Object.keys(a).length !== Object.keys(b).length)
                return false;
            for (len in a) {
                if (!(len in b) || !equals(a[len], b[len])) {
                    return false;
                }
            }
            return true;
        }
    }
    return a !== a && b !== b;
}
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