is undefined divided by zero?
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There is NO solution, so any non-zero number divided by 0 is undefined.
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Undefined = not yet defined. As in, this may have a value or meaning or definition, but we haven't gotten there yet.
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If a variable is accessed before defining then JS will show it as not defined, and if a variables is defined but not initialized I.e. no values is assigned it to it before accessing, then its undefined. Null means an empty or non-existent value. Null is assigned, and explicitly means nothing.
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Answer: Use the equality operator ( == ) In JavaScript if a variable has been declared, but has not been assigned a value, is automatically assigned the value undefined . Therefore, if you try to display the value of such variable, the word "undefined" will be displayed.
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zero slope (when lines are horizontal) undefined slope (when lines are vertical)
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undefined is true because undefined implicitly converts to false , and then ! negates it. Collectively, those values (and false ) are called falsy values. (Anything else¹ is called a truthy value.)
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In JavaScript there is Undefined (type), undefined (value) and undefined (variable). Undefined (type) is a built-in JavaScript type. undefined (value) is a primitive and is the sole value of the Undefined type. Any property that has not been assigned a value, assumes the undefined value.
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3 Answers. In javascript strict mode, undefined is not false, but javascript try to convert the object or var to a boolean value (this is called in javascript truthy value), that's the reason you got an undefined as false.
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Answer: Use the equality operator ( == ) Whereas, the null is a special assignment value, which can be assigned to a variable as a representation of no value. In simple words you can say a null value means no value or absence of a value, and undefined means a variable that has been declared but no yet assigned a value.
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The undefined property indicates that a variable has not been assigned a value, or not declared at all.
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So the correct way to test undefined variable or property is using the typeof operator, like this: if(typeof myVar === 'undefined') .
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Undefined is also a primitive value in JavaScript. A variable or an object has an undefined value when no value is assigned before using it. ... typeof undefined will return undefined not an object. In the above example, we have not assigned any value to a variable named 'myVar'. A variable 'myVar' lacks a value.
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5/0 is an undefined value. This comes from the definition of division. In division, if a/b=c, that means b*c=a. For 5/0, there is no value of c that will make the equation c*0=5 true.
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Null means an empty or non-existent value. Null is assigned, and explicitly means nothing. while undefined typically means a variable has been declared but not defined yet.
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Yes, the slope of the line given by the equation x=0 is undefined.
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A variable is said to be 'undefined' if it has been declared, but no value has been given to it. ... Therefore, 'undefined' is a variable type whereas 'null' is an object value. 'Null' in JavaScript. 'Null' is a keyword in JavaScript that signifies 'no value' or nonexistence of any value.
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If you attempt to find the slope using rise over run or any other slope formula, you will get a 0 in the denominator. Since division by 0 is undefined, the slope of the line is undefined. The equation of a line with undefined slope will look like x = 'something. '