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Why you should care

[/vc_column_text][vc_column_text]While most script engines support Function Declarations within blocks it is not part of ECMAScript (see ECMA-262, clause 13 and 14). Worse implementations are inconsistent with each other and with future EcmaScript proposals. ECMAScript only allows for Function Declarations in the root statement list of a script or function. Instead use a variable initialized with a Function Expression to define a function within a block.[/vc_column_text][vc_empty_space][/vc_column_inner][/vc_row_inner][vc_empty_space height=”12px”][vc_empty_space][vc_separator][vc_column_text]

How we detect

[/vc_column_text][vc_column_text]This Code Insight counts one occurrence each time a function is declared in a block:

Bad Code

if (x) {
function foo() {}
}

Good Code 

function bar() {
  function inner() {return i;}
  if (x) {
     var foo = function() {}; 
   }
}

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References

[/vc_column_text][vc_column_text]https://stackoverflow.com/questions/15663098/function-declarations-should-not-be-placed-in-blocks
https://rules.sonarsource.com/javascript/RSPEC-1530[/vc_column_text][vc_empty_space][vc_row_inner][vc_column_inner][vc_single_image image=”5362″ img_size=”full”][vc_column_text]

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