Plain Javascript Equivalent of jQuery.param()

Question

jQuery.param() takes an array of key-value pairs, and turns it into a string you can use as a query string in HTML requests. For example,

a = {
      userid:1,
         


        

Answer 1

ES6 gives us some nice primitives:

    // Function that parses an object of string key/value params to build up
    // a string of url params
    // requires an object with no nested values
    export function parseUrlParams(urlParams) {
        const joinByEquals = (pair) => pair.join('=')
        const params = Object.entries(urlParams).map(joinByEquals).join('&')
        if (params) {
            return `?${params}`
        } else {
        return ''
        }
    }

See it in action here: https://www.webpackbin.com/bins/-KnpOI6hb1AzTDpN3wS7