| Scope is what defines a variable's access throughout certain parts of a code. If a variable's definition is within a block of instructions (like a function), then this variable is said to have block scope; its value can only be accessed within the block of instructions. If defined outside of a block of instructions, a variable is defined in the global scope, where its value can be accessed anywhere it is invoked. Whenever a definition is unavailable within the block scope, JavaScript will search up the scope chain, through parent scopes of a variable's function, for a definition. Variables declared at the global scope can be troublesome for this reason because it can lead to parent values being altered when running a code and make a function intederminate; it won't return the same value given the same input. Strict mode is a command that, when placed at the top of a JavaScript file, requires a contributor to use let or const when declaring a variable. Not doing so in Strict Mode will return an 'uncaught ref |
| function getTokens(rawString) { | |
| // NB: `.filter(Boolean)` removes any falsy items from an array | |
| return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort(); | |
| } | |
| function mostFrequentWord(text) { // this is our function that takes the argument text. | |
| let words = getTokens(text); // this tells the computer that every true item in the text is a word | |
| let wordFrequencies = {} //wordFrequencies is an array that iterates through the whole text. | |
| for (let i = 0; i <= words.length; i++) { | |
| if (words[i] in wordFrequencies) { |
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| {"lastUpload":"2021-07-06T01:12:24.654Z","extensionVersion":"v3.4.3"} |
Picking the right architecture = Picking the right battles + Managing trade-offs
