@technobuddha/library/toPrimitive/toPrimitive.mjs

A large library of useful functions

import isPrimitive from '../isPrimitive';
import isNull from 'lodash/isNull';
import isUndefined from 'lodash/isUndefined';
/**
 * Convert an object into its primitive (string, number, etc.) value
 *
 * @param input the object
 * @param hint A "hint" as to what the type should be.  "string", "number" or "default"
 * @returns primitive value
 */
export function toPrimitive(input, hint = 'default') {
    let wrapper = input;
    if (isPrimitive(input)) {
        if (isNull(input) || isUndefined(input))
            return input;
        if (typeof (input) === 'string')
            wrapper = String.prototype;
        else if (typeof (input) === 'number')
            wrapper = Number.prototype;
        else if (typeof (input) === 'bigint')
            wrapper = BigInt.prototype;
        else if (typeof (input) === 'boolean')
            wrapper = Boolean.prototype;
        else
            wrapper = Symbol.prototype;
    }
    if (Symbol.toPrimitive in wrapper) {
        return wrapper[Symbol.toPrimitive].call(input, hint);
    }
    else if (hint === 'string') {
        if ('toString' in wrapper)
            return wrapper.toString.call(input);
        else if ('valueOf' in wrapper)
            return wrapper.valueOf.call(input);
    }
    else if ('valueOf' in wrapper) {
        return wrapper.valueOf.call(input);
    }
    else if ('toString' in wrapper) {
        return wrapper.toString.call(input);
    }
    throw new TypeError('Cannot convert object to a primitive value');
}
export default toPrimitive;