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The above example updated with let (instead of var ) throws a ReferenceError , because the variable in the temporal dead zone is not accessible.

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Encouraging the usage of const for immutable bindings or let otherwise ensures a practice that reduces the uninitialized variables appearance.

Tip 2: Increase cohesion

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characterizes the degree to which the elements of a module (namespace, class, method, block of code) belong together. The measurement of the cohesion is usually described as high cohesion or low cohesion .

High cohesion is preferable because it suggests to design the elements of the module to focus solely on a single task. It makes the module:

High cohesion accompanied with AmoonyFashion Womens Round Closed Toe KittenHeels Soft Material LowTop Solid Boots Black Rp6R30
is the characteristic of a well designed system.

A code block by itself might be considered a small module. To profit from the benefits of high cohesion, you need to keep the variables as close as possible to the code block that uses them.

For instance, if a variable solely exists to form the logic of a block scope, then declare and allow the variable to live only within that block (using const or let declarations). Do not expose this variable to the outer block scope, since the outer block shouldn't care about this variable.

One classic example of unnecessary extended life of variables is the usage of for cycle inside a function:

index , item and length variables are declared at the beginning of function body. However they are used only near the end. So what is the problem with such approach?

All the way between the declaration at the top and the usage in for statement the variables index , item are uninitialized and exposed to undefined . They have an unreasonably long lifecycle in the entire function scope.

A better approach is to move these variables as close as possible to their usage place:

index and item variables exist only in the block scope of for statement. They don't have any meaning outside of for . length variable is declared close to the source of its usage too.

Why is the modified version better than the initial one? Let's see:

When accessing a non-existing object property , JavaScript returns undefined .

non-existing object property

Let's demonstrate that in an example:

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favoriteMovie is an object with a single property title . Accessing a non-existing property actors using a property accessor favoriteMovie.actors is evaluated to undefined .

Progress: 80%

Queen's University Belfast

Pupils

1,000

Schools

200

Grant

£526,443

EY

Early Years

Sn

Special Educational Needs

L

Language and literacy

Rosendale Primary School

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A whole-school approach to developing meta-cognitive skills

Progress: 80%

The York Trials Unit

Schools

140

Grant

£697,000

DE

Developing effective learners

Behavioural Insights Team

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Testing an online assessment tool that helps maths teachers to identify and address pupil misconceptions.

Progress: 80%

Schools

175

Grant

TBC

M

Mathematics

F

Feedback monitoring pupil progress

Manchester Metropolitan University

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A trial of Realistic Maths Education, an approach to teaching mathematical problem solving.

Progress: 80%

Schools

120

Grant

£736,322

M

Mathematics

Outwood Institute of Education

M

Mathematics

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Shanghai-style teaching and same-day feedback in KS2 mathematics

Progress: 80%

NatCen

Schools

120

Grant

£213,345

M

Mathematics

F

Feedback monitoring pupil progress

UCL Institute of Education

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Training and support for heads, teachers and teaching assistants on how to use TAs in the classroom

Progress: 80%

Schools

100

Grant

£545,000

Sn

Special Educational Needs

St

Staff deployment development

L

Language and literacy

St Margaret’s Primary School, Kyra Teaching Scho

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