{ "title":"const", "description":"Declares a constant with block level scope", "spec":"https://www.ecma-international.org/ecma-262/6.0/#sec-let-and-const-declarations", "status":"other", "links":[ { "url":"http://generatedcontent.org/post/54444832868/variables-and-constants-in-es6", "title":"Variables and Constants in ES6" }, { "url":"https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const", "title":"MDN Web Docs - const" } ], "bugs":[ ], "categories":[ "JS" ], "stats":{ "ie":{ "5.5":"n", "6":"n", "7":"n", "8":"n", "9":"n", "10":"n", "11":"y" }, "edge":{ "12":"y", "13":"y", "14":"y", "15":"y", "16":"y", "17":"y" }, "firefox":{ "2":"a #1", "3":"a #1", "3.5":"a #1", "3.6":"a #1", "4":"a #1", "5":"a #1", "6":"a #1", "7":"a #1", "8":"a #1", "9":"a #1", "10":"a #1", "11":"a #1", "12":"a #1", "13":"a #2", "14":"a #2", "15":"a #2", "16":"a #2", "17":"a #2", "18":"a #2", "19":"a #2", "20":"a #2", "21":"a #2", "22":"a #2", "23":"a #2", "24":"a #2", "25":"a #2", "26":"a #2", "27":"a #2", "28":"a #2", "29":"a #2", "30":"a #2", "31":"a #2", "32":"a #2", "33":"a #2", "34":"a #2", "35":"a #2", "36":"y", "37":"y", "38":"y", "39":"y", "40":"y", "41":"y", "42":"y", "43":"y", "44":"y", "45":"y", "46":"y", "47":"y", "48":"y", "49":"y", "50":"y", "51":"y", "52":"y", "53":"y", "54":"y", "55":"y", "56":"y", "57":"y", "58":"y", "59":"y", "60":"y", "61":"y" }, "chrome":{ "4":"a #2", "5":"a #2", "6":"a #2", "7":"a #2", "8":"a #2", "9":"a #2", "10":"a #2", "11":"a #2", "12":"a #2", "13":"a #2", "14":"a #2", "15":"a #2", "16":"a #2", "17":"a #2", "18":"a #2", "19":"a #2", "20":"a #2", "21":"a #2 #3", "22":"a #2 #3", "23":"a #2 #3", "24":"a #2 #3", "25":"a #2 #3", "26":"a #2 #3", "27":"a #2 #3", "28":"a #2 #3", "29":"a #2 #3", "30":"a #2 #3", "31":"a #2 #3", "32":"a #2 #3", "33":"a #2 #3", "34":"a #2 #3", "35":"a #2 #3", "36":"a #2 #3", "37":"a #2 #3", "38":"a #2 #3", "39":"a #2 #3", "40":"a #2 #3", "41":"a #4", "42":"a #4", "43":"a #4", "44":"a #4", "45":"a #4", "46":"a #4", "47":"a #4", "48":"a #4", "49":"y", "50":"y", "51":"y", "52":"y", "53":"y", "54":"y", "55":"y", "56":"y", "57":"y", "58":"y", "59":"y", "60":"y", "61":"y", "62":"y", "63":"y", "64":"y", "65":"y", "66":"y", "67":"y" }, "safari":{ "3.1":"a #2", "3.2":"a #2", "4":"a #2", "5":"a #2", "5.1":"a #2 #3", "6":"a #2 #3", "6.1":"a #2 #3", "7":"a #2 #3", "7.1":"a #2 #3", "8":"a #2 #3", "9":"a #2 #3", "9.1":"a #2 #3", "10":"y", "10.1":"y", "11":"y", "11.1":"y", "TP":"y" }, "opera":{ "9":"n", "9.5-9.6":"n", "10.0-10.1":"a #1", "10.5":"a #1", "10.6":"a #1", "11":"a #1", "11.1":"a #1", "11.5":"a #1", "11.6":"a #1 #3", "12":"a #1 #3", "12.1":"a #1 #3", "15":"a #2 #3", "16":"a #2 #3", "17":"a #2 #3", "18":"a #2 #3", "19":"a #2 #3", "20":"a #2 #3", "21":"a #2 #3", "22":"a #2 #3", "23":"a #2 #3", "24":"a #2 #3", "25":"a #2 #3", "26":"a #2 #3", "27":"a #2 #3", "28":"a #4", "29":"a #4", "30":"a #4", "31":"a #4", "32":"a #4", "33":"a #4", "34":"a #4", "35":"a #4", "36":"y", "37":"y", "38":"y", "39":"y", "40":"y", "41":"y", "42":"y", "43":"y", "44":"y", "45":"y", "46":"y", "47":"y", "48":"y", "49":"y", "50":"y", "51":"y", "52":"y" }, "ios_saf":{ "3.2":"a #2", "4.0-4.1":"a #2", "4.2-4.3":"a #2", "5.0-5.1":"a #2 #3", "6.0-6.1":"a #2 #3", "7.0-7.1":"a #2 #3", "8":"a #2 #3", "8.1-8.4":"a #2 #3", "9.0-9.2":"a #2 #3", "9.3":"a #2 #3", "10.0-10.2":"y", "10.3":"y", "11.0-11.2":"y", "11.3":"y" }, "op_mini":{ "all":"a #1 #3" }, "android":{ "2.1":"u", "2.2":"u", "2.3":"a #2", "3":"a #2 #3", "4":"a #2 #3", "4.1":"a #2 #3", "4.2-4.3":"a #2 #3", "4.4":"a #2 #3", "4.4.3-4.4.4":"a #2 #3", "62":"y" }, "bb":{ "7":"a #2 #3", "10":"a #2 #3" }, "op_mob":{ "10":"a #1", "11":"a #1", "11.1":"a #1", "11.5":"a #1", "12":"a #1 #3", "12.1":"a #1 #3", "37":"y" }, "and_chr":{ "64":"y" }, "and_ff":{ "57":"y" }, "ie_mob":{ "10":"n", "11":"y" }, "and_uc":{ "11.8":"y" }, "samsung":{ "4":"a #4", "5":"y", "6.2":"y" }, "and_qq":{ "1.2":"a #2 #3" }, "baidu":{ "7.12":"a #4" } }, "notes":"", "notes_by_num":{ "1":"const is recognized, but treated like var (no block scope, can be overwritten)", "2":"const does not have block scope", "3":"Only recognized when NOT in strict mode", "4":"Supported correctly in strict mode, otherwise supported without block scope" }, "usage_perc_y":89.71, "usage_perc_a":7.98, "ucprefix":false, "parent":"", "keywords":"ES6,constant,block,scope", "ie_id":"", "chrome_id":"4645595339816960", "firefox_id":"", "webkit_id":"", "shown":true }