Run results for: JSON.parse vs recursive

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/121.0.6167.138 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 121

Operating system: iOS 17.1

Device Platform: Mobile

Date tested: 9 months ago

Test name	Executions per second
JSON.parse	442275.9 Ops/sec
Recursive interpolate	540460.2 Ops/sec

Script Preparation code:

function isStringOrNumber(value){
  return (
    value !== undefined &&
    value !== null &&
    !Number.isNaN(value) &&
    (typeof value === 'string' || typeof value === 'number')
  );
}

function recursiveReplaceTemplateStrings(
    obj,
    templateDict,
    ignoreFieldFunc,
    currentPath) {

    if (Array.isArray(obj)) {
        return obj.map((item) =>
            recursiveReplaceTemplateStrings(item, templateDict, ignoreFieldFunc, currentPath),
        );
    }

    if (typeof obj === 'object' && obj !== null) {
        var newObj = {};

        Object.keys(obj).forEach((key) => {
            var value = obj[key];
            var keyPath = currentPath ? `${currentPath}.${key}` : key;

            if (typeof value !== 'string') {
                // Recursively call the function for non-string values
                newObj[key] = recursiveReplaceTemplateStrings(
                    obj[key],
                    templateDict,
                    ignoreFieldFunc,
                    keyPath,
                );
                return;
            }

            if (!ignoreFieldFunc?.(key, currentPath)) {
                var regex = /\[%([^%]+)%]/g;

                newObj[key] = value.replace(regex, (_, dictKey) => {
                    var actualValue = templateDict[dictKey];

                    return isStringOrNumber(actualValue) ? `${actualValue}` : '';
                });

                return;
            }

            newObj[key] = value;
        });

        return newObj;
    }

    return obj;
}

function jsonReplaceTemplateStrings(
    obj,
    templateDict,
    ignoreFieldFunc,
    currentPath,
) {
    var jsonStr = JSON.stringify(obj, (key, value) => {
        if (typeof value === 'string') {
            if (!ignoreFieldFunc?.(key, currentPath)) {
                var regex = /\[%([^%]+)%]/g;
                return value.replace(regex, (_, dictKey) => {
                    const actualValue = templateDict[dictKey];
                    return isStringOrNumber(actualValue) ? "" + actualValue : '';
                });
            }
        }
        return value;
    });
    return JSON.parse(jsonStr);

}


var ignoreFieldFunc = (key, path) => {
    const nonInterpolatedFields = ['id', 'type', 'data.id'];
    return nonInterpolatedFields.some((val) => val === key || val === `${path}.${key}`);
};
var obj = {
    id: 'some_id_[%some_id_part%]',
    type: 'flex',
    title: 'Hello, [%user_name%]!',
    data: {
        id: 'some_nested_id_[%some_nested_id_part%]',
        options: [{
            id: 'some_nested_array_id_[%some_nested_array_id_part%]',
            text: 'option [%some_option_part%]',
        }, ],
    },
};
var templateDict = {
    some_id_part: 'unexpected_id_part',
    some_nested_id_part: 'unexpected_nested_id_part',
    some_nested_array_id_part: 'unexpected_nested_array_id_part',
    user_name: 'Jane',
    some_option_part: 'A',
};
var expected = {
    id: 'some_id_[%some_id_part%]',
    type: 'flex',
    title: 'Hello, Jane!',
    data: {
        id: 'some_nested_id_[%some_nested_id_part%]',
        options: [{
            id: 'some_nested_array_id_[%some_nested_array_id_part%]',
            text: 'option A'
        }],
    },
};

Tests:

JSON.parse
jsonReplaceTemplateStrings(obj, templateDict, ignoreFieldFunc)
Recursive interpolate
recursiveReplaceTemplateStrings(obj, templateDict, ignoreFieldFunc)

Run results for: JSON.parse vs recursive

JSON.parse

Recursive interpolate