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Ilya Kantor 2019-01-13 20:39:56 +03:00
parent 7e5ffe269e
commit ed4878f269
2 changed files with 10 additions and 8 deletions
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14
1-js/02-first-steps/06-type-conversions/1-primitive-conversions-questions/solution.md
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@ -10,13 +10,15 @@ true + false = 1
"4" - 2 = 2 "4" - 2 = 2
"4px" - 2 = NaN "4px" - 2 = NaN
7 / 0 = Infinity 7 / 0 = Infinity
" -9\n" + 5 = " -9\n5" " -9 " + 5 = " -9 5" // (3)
" -9\n" - 5 = -14 " -9 " - 5 = -14 // (4)
null + 1 = 1 // (3) null + 1 = 1 // (5)
undefined + 1 = NaN // (4) undefined + 1 = NaN // (6)
``` ```
1. The addition with a string `"" + 1` converts `1` to a string: `"" + 1 = "1"`, and then we have `"1" + 0`, the same rule is applied. 1. The addition with a string `"" + 1` converts `1` to a string: `"" + 1 = "1"`, and then we have `"1" + 0`, the same rule is applied.
2. The subtraction `-` (like most math operations) only works with numbers, it converts an empty string `""` to `0`. 2. The subtraction `-` (like most math operations) only works with numbers, it converts an empty string `""` to `0`.
3. `null` becomes `0` after the numeric conversion. 3. The addition with a string appends the number `5` to the string.
4. `undefined` becomes `NaN` after the numeric conversion. 4. The subtraction always converts to numbers, so it makes `" -9 "` a number `-9` (ignoring spaces around it).
5. `null` becomes `0` after the numeric conversion.
6. `undefined` becomes `NaN` after the numeric conversion.

4
1-js/02-first-steps/06-type-conversions/1-primitive-conversions-questions/task.md
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@ -17,8 +17,8 @@ true + false
"4" - 2 "4" - 2
"4px" - 2 "4px" - 2
7 / 0 7 / 0
" -9\n" + 5 " -9 " + 5
" -9\n" - 5 " -9 " - 5
null + 1 null + 1
undefined + 1 undefined + 1
``` ```