const
26
MENTIONS
8
EPISODES
2
PODCASTS
Search complete. 26 mentions across 8 episodes found for "const".
Sep 17, 2026
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Name, Bob, age, 25.
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Const names equals users dot map user equals greater than user dot name.
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Slash slash names is Alice, Bob.
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Key point to remember, if your callback does not return anything, map produces an array full of undefined values.
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Example.
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Keep only even numbers.
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Const numbers equals 1, 2, 3, 4, 5, 6.
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Const evens equals numbers.filter n equals greater than n% 2 equals equals equals 0.
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Mini example.
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Const prices equals 10, 25, 40.
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Const discounted equals prices.map p equals greater than p 0.9 slash slash 9 22.5 36 const expensive equals prices.filter p equals greater than p greater than 20 slash slash 25 40 const total equals prices.reduce he p equals greater than he plus p 0 slash slash 75.
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Keep this model in mind.
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Select transform aggregate.
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Examples.
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Const fruits equals apple, banana, cherry.
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Const numbers equals 10, 20, 30, 40.
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Const empty equals.
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In the first example, apple is at index 0, banana is at index 1, and cherry is at index 2.
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The third example creates an empty array with no elements yet.
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Array.isArrayHello returns false.
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Destructuring arrays, ES6 feature, ES6 introduced array destructuring, a fast way to extract values from an array into separate variables.
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For example, number of clicks.
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Constants that never change are often written in uppercase with underscores.
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For example, max underscore attempts.
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Avoid single letters, except for short loop counters like I, abbreviations that are not obvious, and names that lie about what the value contains.
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Say hello.
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Const say hello equals, equals greater than console.log high.
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The second example throws an error because the arrow function is not yet defined when it is called.
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Choosing which to use.
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With const, you must assign a value immediately when declaring it.
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The following is invalid.
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Const name, slash slash error.
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Missing initializer in const declaration.
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Important nuance about const and objects.
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Const prevents reassignment of the variable itself, but it does not make the content immutable when the value is an object or an array.
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You cannot reassign the variable, but you can still modify the properties or elements inside.
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Example, const user equals name Alice.
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Modern JavaScript also offers a shorter form called an arrow function.
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Const find minimum equals numbers equals greater than both do the same job.
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Working with lists.
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In JavaScript, a list is written with square brackets.
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Comments in JavaScript start with two slashes, slash, slash for a single line or are wrapped in for several lines.
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Let us tie everything together with a complete example that reuses your cash register logic in JavaScript.
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Const prices equals twelve, eight, twenty-five.
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Let total equal zero.
Danté StewartGUEST
I think on some level, we the people, in order to form a more perfect union, to establish justice, to ensure domestic tranquility.
Danté StewartGUEST
At the beginning of the Consti- the, the, the, uh, Constitution in the Preamble, that in some sense is the ghost that haunt us right now spiritually.
Danté StewartGUEST
We're struggling with we the people.
Danté StewartGUEST
Now, if I can, let me put on reverend hat real quick and let me turn into a preacher.