javascript - 'use strict' not stopping hoisting in function scope -


my problem lies here i'm learning javascript not new programming @ all. understand hoisting, strict mode shouldn't produce error , caught either when 6 assigned undeclared variable or document.getelement... assigned x doesn't produce error diagnosis hoisting still going on..which don't , want rid of using strict. using chrome version 42.0.2311.152 m browser

function strictmode(){     'use strict';     try {         x = 6;         document.getelementbyid('hoisting').innerhtml = x;         var x;      }      catch(err) {                     document.getelementbyid('error_report').innerhtml =                          "there error occured (were in strict mode)" +                             " " + err.message;                } }

variable declarations (i.e. var x;) valid entire scope written in, if declare after assign. meant "hoisting": var x; hoisted beginning of scope, , assignment x = 6; fine because x has been declared somewhere in scope.

strict mode not change of this. would throw error if omitted var x; declaration altogether; without strict mode, variable's scope implicitly global scope.

in es2015 (a.k.a. es6), hoisting avoided using let keyword instead of var. (the other difference variables declared let local surrounding block, not entire function.)


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