{"id":15844837,"url":"https://github.com/rajikaimal/immutable-js","last_synced_at":"2025-04-01T17:45:19.758Z","repository":{"id":89374295,"uuid":"60401637","full_name":"rajikaimal/immutable-js","owner":"rajikaimal","description":"List of immutable functions in 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href=\"https://promisesaplus.com/\"\u003e\n    \u003cimg src=\"https://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/JavaScript-logo.png/768px-JavaScript-logo.png\" width=\"100\" align=\"right\" /\u003e\n\u003c/a\u003e\n\n# immutable-js\n\nList of immutable functions in JavaScript\n\n- [1.0](#1.0) \u003ca name='1.0'\u003e\u003c/a\u003e slice\n\n  ```js\n  // extracts certain section of a string and return a new string\n  // doesn't mutate the original string\n  \n  var name = 'Stephanie Hwang'\n  var first = name.slice(0, 8)\n  \n  console.log(name) //Stephanie Hwang\n  console.log(first) //Stepanie\n  console.log(name) //Stephanie Hwang\n  ```\n\n- [2.0](#2.0) \u003ca name='1.0'\u003e\u003c/a\u003e concat\n\n  ```js\n  // concatenate two strings\n  // returns a new string\n  \n  var first = 'Stephanie'\n  var last = ' Hwang'\n  \n  var fullName = first.concat(last);\n  \n  console.log(first) //Stephanie\n  console.log(last) //Hwang\n  console.log(fullName) //Stephanie Hwang\n  console.log(first) //Stephanie\n  console.log(last) //Hwang\n  \n  ```\n  \n- [3.0](#3.0) \u003ca name='1.0'\u003e\u003c/a\u003e replace\n\n  ```js\n  // replaces matching section of a the string which is explicitly passed to replace function\n  \n  var re = /Harry/gi\n  var str = \"Harry is a memeber of gryffindor.\"\n  var newstr = str.replace(re, \"Hermione\")\n           \n  console.log(str) //Harry is a memeber of gryffindor.\n  console.log(newstr) //Hermione is a memeber of gryffindor.\n  console.log(str) //Harry is a memeber of gryffindor.\n  ```\n  \n- [4.0](#4.0) \u003ca name='1.0'\u003e\u003c/a\u003e split\n\n  ```js\n  //split a given string into an array of strings\n  \n  var str = \"Apples are round, and apples are juicy.\";\n  var newstr = str.split(\" \", 2);\n           \n  console.log(str) //Apples are round, and apples are juicy.\n  console.log(newstr) //['Apples', 'are']\n  console.log(str) //Apples are round, and apples are juicy.\n  ```\n- [5.0](#5.0) \u003ca name='1.0'\u003e\u003c/a\u003e substr\n\n  ```js\n  //extracts part of a string\n  \n  var str = \"Ten points for gryffindor\"\n  var newstr = str.substr(0, 3)\n           \n  console.log(str) //Ten points for gryffindor\n  console.log(newstr) //Ten\n  console.log(str) //Ten points for gryffindor\n  ```\n  \n- [6.0](#6.0) \u003ca name='1.0'\u003e\u003c/a\u003e substring\n\n  ```js\n  //extracts part of a string\n  \n  var str = \"Ten points for gryffindor\"\n  var newstr = str.substring(0, 3)\n           \n  console.log(str) //Ten points for gryffindor\n  console.log(newstr) //Ten\n  console.log(str) //Ten points for gryffindor\n  ```\n\n- [7.0](#7.0) \u003ca name='1.0'\u003e\u003c/a\u003e toLocaleLowerCase\n\n  ```js\n  //converts string to lowercase by keeping it's current locale\n  \n  var str = \"Ron loves Hermionie\"\n  var newstr = str.toLocaleLowerCase()\n           \n  console.log(str) //Ron loves Hermionie\n  console.log(newstr) //ron loves hermionie\n  console.log(str) //Ron loves Hermionie\n  ```\n  \n- [8.0](#8.0) \u003ca name='1.0'\u003e\u003c/a\u003e toLocaleUpperCase\n\n  ```js\n  //converts string to uppercase by keeping it's current locale\n  \n  var str = \"Ron loves Hermionie\"\n  var newstr = str.toLocaleUpperCase()\n           \n  console.log(str) //Ron loves Hermionie\n  console.log(newstr) //RON LOVES HERMIONIE\n  console.log(str) //Ron loves Hermionie\n  ```\n  \n- [9.0](#9.0) \u003ca name='1.0'\u003e\u003c/a\u003e toString\n\n  ```js\n  //converts type to represent string\n  \n  var phone = 124587921\n  var phonestr = phone.toString()\n           \n  console.log(phone) //124587921\n  console.log(phonestr) // \"124587921\"\n  console.log(phone) //124587921\n  ```\n  \n- [10.0](#10.0) \u003ca name='1.0'\u003e\u003c/a\u003e toLowerCase\n\n  ```js\n  //converts string to lowercase\n  \n  var str = \"Ron loves Hermionie\"\n  var newstr = str.toLocaleLowerCase()\n           \n  console.log(str) //Ron loves Hermionie\n  console.log(newstr) //ron loves hermionie\n  console.log(str) //Ron loves Hermionie\n  ```\n  \n- [11.0](#11.0) \u003ca name='1.0'\u003e\u003c/a\u003e toUpperCase\n\n  ```js\n  //converts string to uppercase\n  \n  var str = \"Ron loves Hermionie\"\n  var newstr = str.toLocaleUpperCase()\n           \n  console.log(str) //Ron loves Hermionie\n  console.log(newstr) //RON LOVES HERMIONIE\n  console.log(str) //Ron loves Hermionie\n  ```\n  \n- [12.0](#12.0) \u003ca name='1.0'\u003e\u003c/a\u003e map\n\n  ```js\n  //iterates through an array\n  \n  var names = ['rajika', 'stephanie', 'taeyeon']\n  names.map(function(name) {\n      console.log(name)\n  })\n  //es6 syntax, arrow function\n  //names.map((name) =\u003e {\n  //  console.log(name)\n  //})\n  console.log(names)\n  ```\n  \n- [13.0](#12.0) \u003ca name='1.0'\u003e\u003c/a\u003e reduce\n\n  ```js\n  \n  var arr = [1,2,3,4]\n\n  var total = arr.reduce(function(prev, curr, index, arr) {\n    return prev + curr\n  });\n\n  console.log(arr) // [1,2,3,4]\n  console.log(total) //10\n  console.log(arr) // [1,2,3,4]\n  //es6 syntax, arrow function\n  //var total = arr.reduce((prev, curr, index, arr) =\u003e {\n    //return prev + curr\n  //});\n  ```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frajikaimal%2Fimmutable-js","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Frajikaimal%2Fimmutable-js","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frajikaimal%2Fimmutable-js/lists"}