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Disallow unnecessary concatenation of strings (no-useless-concat)

It's unnecessary to concatenate two strings together, such as:

var foo = "a" + "b";

This code is likely the result of refactoring where a variable was removed from the concatenation (such as "a" + b + "b"). In such a case, the concatenation isn't important and the code can be rewritten as:

var foo = "ab";

Rule Details

This rule aims to flag the concatenation of 2 literals when they could be combined into a single literal. Literals can be strings or template literals.

Examples of incorrect code for this rule:

/*eslint no-useless-concat: "error"*/
/*eslint-env es6*/

// these are the same as "10"
var a = `some` + `string`;
var a = '1' + '0';
var a = '1' + `0`;
var a = `1` + '0';
var a = `1` + `0`;

Examples of correct code for this rule:

/*eslint no-useless-concat: "error"*/

// when a non string is included
var c = a + b;
var c = '1' + a;
var a = 1 + '1';
var c = 1 - 2;
// when the string concatenation is multiline
var c = "foo" +
    "bar";

When Not To Use It

If you don't want to be notified about unnecessary string concatenation, you can safely disable this rule. Source: http://eslint.org/docs/rules/

      infoWindowContent.push(['<div class="info_content">' + "<h3><a href='/posts/" +  markers[i]["id"] + "'" + 'target="_blank" rel="noopener noreferrer">' + markers[i]["marker_title"] + '</a></h3>' + '<p>'+ window.authors[i] + '</p>' + '</div>']);

Close

Disallow unnecessary concatenation of strings (no-useless-concat)

It's unnecessary to concatenate two strings together, such as:

var foo = "a" + "b";

This code is likely the result of refactoring where a variable was removed from the concatenation (such as "a" + b + "b"). In such a case, the concatenation isn't important and the code can be rewritten as:

var foo = "ab";

Rule Details

This rule aims to flag the concatenation of 2 literals when they could be combined into a single literal. Literals can be strings or template literals.

Examples of incorrect code for this rule:

/*eslint no-useless-concat: "error"*/
/*eslint-env es6*/

// these are the same as "10"
var a = `some` + `string`;
var a = '1' + '0';
var a = '1' + `0`;
var a = `1` + '0';
var a = `1` + `0`;

Examples of correct code for this rule:

/*eslint no-useless-concat: "error"*/

// when a non string is included
var c = a + b;
var c = '1' + a;
var a = 1 + '1';
var c = 1 - 2;
// when the string concatenation is multiline
var c = "foo" +
    "bar";

When Not To Use It

If you don't want to be notified about unnecessary string concatenation, you can safely disable this rule. Source: http://eslint.org/docs/rules/

      infoWindowContent.push(['<div class="info_content">' + "<h3><a href='/posts/" +  markers[i]["id"] + "'" + 'target="_blank" rel="noopener noreferrer">' + markers[i]["marker_title"] + '</a></h3>' + '<p>'+ window.authors[i] + '</p>' + '</div>']);

Close

Disallow unnecessary concatenation of strings (no-useless-concat)

It's unnecessary to concatenate two strings together, such as:

var foo = "a" + "b";

This code is likely the result of refactoring where a variable was removed from the concatenation (such as "a" + b + "b"). In such a case, the concatenation isn't important and the code can be rewritten as:

var foo = "ab";

Rule Details

This rule aims to flag the concatenation of 2 literals when they could be combined into a single literal. Literals can be strings or template literals.

Examples of incorrect code for this rule:

/*eslint no-useless-concat: "error"*/
/*eslint-env es6*/

// these are the same as "10"
var a = `some` + `string`;
var a = '1' + '0';
var a = '1' + `0`;
var a = `1` + '0';
var a = `1` + `0`;

Examples of correct code for this rule:

/*eslint no-useless-concat: "error"*/

// when a non string is included
var c = a + b;
var c = '1' + a;
var a = 1 + '1';
var c = 1 - 2;
// when the string concatenation is multiline
var c = "foo" +
    "bar";

When Not To Use It

If you don't want to be notified about unnecessary string concatenation, you can safely disable this rule. Source: http://eslint.org/docs/rules/

      infoWindowContent.push(['<div class="info_content">' + "<h3><a href='/posts/" +  markers[i]["id"] + "'" + 'target="_blank" rel="noopener noreferrer">' + markers[i]["marker_title"] + '</a></h3>' + '<p>'+ window.authors[i] + '</p>' + '</div>']);

Close

Disallow unnecessary concatenation of strings (no-useless-concat)

It's unnecessary to concatenate two strings together, such as:

var foo = "a" + "b";

This code is likely the result of refactoring where a variable was removed from the concatenation (such as "a" + b + "b"). In such a case, the concatenation isn't important and the code can be rewritten as:

var foo = "ab";

Rule Details

This rule aims to flag the concatenation of 2 literals when they could be combined into a single literal. Literals can be strings or template literals.

Examples of incorrect code for this rule:

/*eslint no-useless-concat: "error"*/
/*eslint-env es6*/

// these are the same as "10"
var a = `some` + `string`;
var a = '1' + '0';
var a = '1' + `0`;
var a = `1` + '0';
var a = `1` + `0`;

Examples of correct code for this rule:

/*eslint no-useless-concat: "error"*/

// when a non string is included
var c = a + b;
var c = '1' + a;
var a = 1 + '1';
var c = 1 - 2;
// when the string concatenation is multiline
var c = "foo" +
    "bar";

When Not To Use It

If you don't want to be notified about unnecessary string concatenation, you can safely disable this rule. Source: http://eslint.org/docs/rules/

        google.maps.event.addListener(marker, 'click', (function(marker, i) {

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Require IIFEs to be Wrapped (wrap-iife)

You can immediately invoke function expressions, but not function declarations. A common technique to create an immediately-invoked function expression (IIFE) is to wrap a function declaration in parentheses. The opening parentheses causes the contained function to be parsed as an expression, rather than a declaration.

// function expression could be unwrapped
var x = function () { return { y: 1 };}();

// function declaration must be wrapped
function () { /* side effects */ }(); // SyntaxError

Rule Details

This rule requires all immediately-invoked function expressions to be wrapped in parentheses.

Options

This rule has two options, a string option and an object option.

String option:

• "outside" enforces always wrapping the call expression. The default is "outside".
• "inside" enforces always wrapping the function expression.
• "any" enforces always wrapping, but allows either style.

Object option:

• "functionPrototypeMethods": true additionally enforces wrapping function expressions invoked using .call and .apply. The default is false.

outside

Examples of incorrect code for the default "outside" option:

/*eslint wrap-iife: ["error", "outside"]*/

var x = function () { return { y: 1 };}(); // unwrapped
var x = (function () { return { y: 1 };})(); // wrapped function expression

Examples of correct code for the default "outside" option:

/*eslint wrap-iife: ["error", "outside"]*/

var x = (function () { return { y: 1 };}()); // wrapped call expression

inside

Examples of incorrect code for the "inside" option:

/*eslint wrap-iife: ["error", "inside"]*/

var x = function () { return { y: 1 };}(); // unwrapped
var x = (function () { return { y: 1 };}()); // wrapped call expression

Examples of correct code for the "inside" option:

/*eslint wrap-iife: ["error", "inside"]*/

var x = (function () { return { y: 1 };})(); // wrapped function expression

any

Examples of incorrect code for the "any" option:

/*eslint wrap-iife: ["error", "any"]*/

var x = function () { return { y: 1 };}(); // unwrapped

Examples of correct code for the "any" option:

/*eslint wrap-iife: ["error", "any"]*/

var x = (function () { return { y: 1 };}()); // wrapped call expression
var x = (function () { return { y: 1 };})(); // wrapped function expression

functionPrototypeMethods

Examples of incorrect code for this rule with the "inside", { "functionPrototypeMethods": true } options:

/* eslint wrap-iife: [2, "inside", { functionPrototypeMethods: true }] */

var x = function(){ foo(); }()
var x = (function(){ foo(); }())
var x = function(){ foo(); }.call(bar)
var x = (function(){ foo(); }.call(bar))

Examples of correct code for this rule with the "inside", { "functionPrototypeMethods": true } options:

/* eslint wrap-iife: [2, "inside", { functionPrototypeMethods: true }] */

var x = (function(){ foo(); })()
var x = (function(){ foo(); }).call(bar)

Source: http://eslint.org/docs/rules/