PHP's print_r in JavaScript

Here’s what our current JavaScript equivalent to PHP's print_r looks like.

module.exports = function print_r (array, returnVal) { // eslint-disable-line camelcase
// discuss at: https://locutus.io/php/print_r/
// original by: Michael White (https://getsprink.com)
// improved by: Ben Bryan
// improved by: Brett Zamir (https://brett-zamir.me)
// improved by: Kevin van Zonneveld (https://kvz.io)
// input by: Brett Zamir (https://brett-zamir.me)
// example 1: print_r(1, true)
// returns 1: '1'
const echo = require('../strings/echo')
let output = ''
const padChar = ' '
const padVal = 4
const _repeatChar = function (len, padChar) {
let str = ''
for (let i = 0; i < len; i++) {
str += padChar
}
return str
}
var _formatArray = function (obj, curDepth, padVal, padChar) {
if (curDepth > 0) {
curDepth++
}
const basePad = _repeatChar(padVal * curDepth, padChar)
const thickPad = _repeatChar(padVal * (curDepth + 1), padChar)
let str = ''
if (typeof obj === 'object' &&
obj !== null &&
obj.constructor) {
str += 'Array\n' + basePad + '(\n'
for (const key in obj) {
if (Object.prototype.toString.call(obj[key]) === '[object Array]') {
str += thickPad
str += '['
str += key
str += '] => '
str += _formatArray(obj[key], curDepth + 1, padVal, padChar)
} else {
str += thickPad
str += '['
str += key
str += '] => '
str += obj[key]
str += '\n'
}
}
str += basePad + ')\n'
} else if (obj === null || obj === undefined) {
str = ''
} else {
// for our "resource" class
str = obj.toString()
}
return str
}
output = _formatArray(array, 0, padVal, padChar)
if (returnVal !== true) {
echo(output)
return true
}
return output
}
[ View on GitHub | Edit on GitHub | Source on GitHub ]

How to use

You you can install via npm install locutus and require it via require('locutus/php/var/print_r'). You could also require the var module in full so that you could access var.print_r instead.

If you intend to target the browser, you can then use a module bundler such as Parcel, webpack, Browserify, or rollup.js. This can be important because Locutus allows modern JavaScript in the source files, meaning it may not work in all browsers without a build/transpile step. Locutus does transpile all functions to ES5 before publishing to npm.

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we don't consider it to be a bad thing that many of our functions are first iterations, which may still have their fair share of issues. We hope that these flaws will inspire others to come up with better ideas.

This way of working also means that we don't offer any production guarantees, and recommend to use Locutus inspiration and learning purposes only.

Examples

Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#codeexpected result
1print_r(1, true)'1'

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