WM4 | Fatima Safana |Module 2/Sprint1 Exercises | Week4 #213
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| const cardNumber = 4533787178994213; | |||
| const cardNumber = "4533787178994213"; | |||
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If you cannot modify this statement const cardNumber = 4533787178994213;
(that is, keep the variable's value unchanged),
how would you modify the code so that it can still extract the last 4 digits from its value.
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the type of variable needs to string for .slice() method to work.
| const twelveHourClockTime = "20:53"; |
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Have you also noticed the variable names do not quite match the values assigned to the variable?
| console.log(wholeNumberPart) | ||
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| let decimalPart = num - Math.floor(num); | ||
| console.log(decimalPart); |
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If you run the program, you may notice that console.log() outputs the value of decimalPart
with more than 4 decimal places (which is normal because of floating point arithmetic).
If you were asked to print the value of decimalPart to exactly 4 decimal places,
how would you modify the code?
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let decimalPart = (num - Math.floor(num)).toFixed(4);
console.log(decimalPart);
| console.log(`The base part of ${filePath} is ${base}`); | ||
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| // Create a variable to store the dir part of the filePath variable | ||
| // Create a variable to store the ext part of the variable | ||
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| const dirPart = filePath.substring(45, -1); |
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Your code should be written to to work for any valid value of filePath.
For example, "/path1/path2/package.json".
| const dirPart = filePath.substring(45, -1); | ||
| console.log(`The directory path of ${dirPart}`); | ||
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| const extPart = dirPart + "ext.txt"; |
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The "ext part" refers to the file extension of the file represented by the file path, which is the string after the dot in the base (including the dot).
So the file extension of "package.json" would be ".json".
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| console.log(num); | ||
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| // The program creates a random whole number between 1 and 100, max and min inclusive. |
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This exercise was expecting you to break down
the expression Math.floor(Math.random() * (maximum - minimum + 1)) + minimum, and explain
why such expression can correctly produce a random integer in the range [1, 100].
Also, to test your understanding, how would you write an expression
(without using any variable in the expression) that yields a random
integer between -5 and 3 (including -5 and 3)?
| // 3. initializes a variable that removes the "p" at the end, it uses method .substring | ||
| // which returns the part of the string corresponding to the index and end index | ||
| //-1 excluding the p | ||
| //9. uses the method padstart to add "0" to the start of string penceStringWithoutTrailingP, |
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After line 9, what would paddedPenceNumberString be if penceString was "1234p" initially?
After line 9, what would paddedPenceNumberString be if penceString was "4p" initially?
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It will return 1234
It will return 004
| // this effectively multiplies any value input as penceStringWithoutTrailingP by 100 | ||
| //12. uses the substring method to return the first value of the string, this is to get | ||
| // the pound. it also used length -2 to make sure its in a valid range so the program | ||
| // can go through the steps with any value input. |
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What do you mean by "first value of the string"?
length - 2 is a valid range but "making sure its in a valid range" is not quite the reason why length - 2
is used in the code.
| //12. uses the substring method to return the first value of the string, this is to get | ||
| // the pound. it also used length -2 to make sure its in a valid range so the program | ||
| // can go through the steps with any value input. | ||
| //18.the code gets the last two digits from the paddedPenceNumberString and ensures that the result |
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Can we expect this program to work as intended even if we deleted .padEnd(2, "0") from the code?
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no, it will not work for single digit or double digits input
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Well, can you find a value of penceString to show that the function won't work properly without .padEnd(2, "0")?
cjyuan
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Thank you @cjyuan for reviewing my code, I appreciate the feedback. |
Merge branch 'sprint-1-exercises' of https://github.com/Fatimasfn/Module-Structuring-and-Testing-Data into sprint-1-exercises
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