14432073
Descrição
FlashCards por Jonathan Sequeira, atualizado more than 1 year ago
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Criado por Jonathan Sequeira
mais de 6 anos atrás
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| Questão | Responda |
| What is the var statement? | The var statement declares a global scope variable |
| What is the let statement? | The let statement declares a block scope local variable |
| what is the const statement? | Constants are block-scoped, much like variables defined using the let statement. The value of a constant cannot change through re-assignment, and it can't be re-declared. |
| How do you display to the console? | console.log(); |
| What are the mathematical operators? | (+) = plus (- )= minus (/) = division no remainder (%) = Modulus remainder |
| What is the purpose of an Assignment Operator? | Uses the current value of a variable, and adds another value |
| What is string interpolation? | The JavaScript term for inserting data saved to a variable into a string |
| `What are back ticks ?` | Same as typing a string but you can insert variables though formatting with `${Variable}` |
| What is an if statement? | An if statement takes a parameter with a Boolean expression if condition is true it executes the block of code |
| What is an else statement? | An else statement is followed by an if statement it is a block of code that is executed when the condition in the if statement is false |
| In JavaScript, all values have a truthy or falsy value what variables return false? | False, 0 & -0, "" & '', null, undefined, NaN |
| What does the !not operator do? | The !not operator makes a true statement false and false statement true |
| What are the comparison operators and what do they return? | < , >, <=, >= These Operators return true or false |
| What are the comparison operators and what do they do? | "===" Checks if two values are equal to each other "!==" Check if two values are not equal to each other |
| What is an "else if" statement? | An else if statement checks another Boolean condition when a previous condition is false |
| What is the structure of a switch statement? | switch (variable) { case 'possible condition' : "block of code to execute" break; case 'possible condition' : "block of code to execute" break; default: "block of code to execute" break; } |
| What are the logic operators? | && , || |
| What is a Ternary Operator? | converts a simple if/else structured block into a single line short hand ex. Boolean value ? if true execute this : else execute this; |
| What is the structure of an arrow function? | cons function name = (parameter) => { Code block to execute }; a function can have as many parameters needed |
| What is the return keyword? | The return keyword returns a value inside of a function |
| What is the Structure of a Function Declaration | function "name" (parameter) { code block } |
| What is the Structure of a Function Expression? | const name = function (parameter) { code block }; Function Expressions omit the identifier following the function key word usually stored in variables |
| Refactoring Arrow Functions | Functions that take a single parameter do not need a parenthesis, a return, or brackets. An implicit return occurs |
| How do you declare an array? | let "name" = [Array Elements]; |
| How do you return the amount of elements in an array? | array.length; |
| How do you access an index of an array? | array[index]; |
| How do you re-assign an element value? | array[index] = "value"; |
| What does the push method do? | array.push(parameter); Takes the values of the parameters and pushes those elements to the end of the array elements. |
| What does the pop method do? | array.pop() The pop() method removes the last element from an array and returns that element. This method changes the length of the array. |
| What does the shift method do? | The shift() method removes the first element from an array and returns that removed element. This method changes the length of the array. |
| What does the slice method do? | The slice(from index, to index) method returns a a new string by extracting the index range of he original array. The original array will not be modified. |
| What does the splice method do? | The splice(index selected, amount of elements to be removed, replacement value) method changes the contents of an array by removing existing elements and/or adding new elements. |
| What does the splice method do? | The join() method joins all elements of an array (or an array-like object) into a string and returns this string. |
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