@redocly/openapi-core/lib/utils/is-ordered.js

See https://github.com/Redocly/redocly-cli

export function isOrdered(value, options) {
    const direction = options.direction || options;
    const property = options.property;
    for (let i = 1; i < value.length; i++) {
        let currValue = value[i];
        let prevVal = value[i - 1];
        if (property) {
            const currPropValue = value[i][property];
            const prevPropValue = value[i - 1][property];
            if (!currPropValue || !prevPropValue) {
                return false; // property doesn't exist, so collection is not ordered
            }
            currValue = currPropValue;
            prevVal = prevPropValue;
        }
        if (typeof currValue === 'string' && typeof prevVal === 'string') {
            currValue = currValue.toLowerCase();
            prevVal = prevVal.toLowerCase();
        }
        const result = direction === 'asc' ? currValue >= prevVal : currValue <= prevVal;
        if (!result) {
            return false;
        }
    }
    return true;
}
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