Ahmad's Underpants #15
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| // Adds first 'num' values to items | ||
| var items = []; | ||
| for (var i = 0; i < num; i++) { | ||
| items.push(arr[i]); | ||
| } | ||
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| // Returns new array | ||
| return items; |
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@AFord504 is there a way you could implement the native .slice method to complete this without using a loop?
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| // Adds last 'num' values to items | ||
| var items = []; | ||
| for (var i = arr.length - num; i < arr.length; i++) { | ||
| items.push(arr[i]) | ||
| } | ||
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| // Returns new array | ||
| return items; |
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Same question as above - how might you implement the native .slice method to to solve this part of _.last()?
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| if (Array.isArray(coll)) { | ||
| _.each(coll, (element, index, array) => output.push(func(element, index, array))); | ||
| } else if (_.typeOf(coll) === 'object') { | ||
| for (var [key, value] of Object.entries(coll)) { | ||
| output.push(func(value, key, coll)) | ||
| } | ||
| } |
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Is the if statement here necessary - didn't you write some similar logic already inside your _.each method to check for object literals vs. arrays?
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| var output = _.map(arr, function (element) { | ||
| // Iterates over objects in 'arr' | ||
| for (var [key, value] of Object.entries(element)) { | ||
| // Finds 'prop' and returns its value | ||
| var val; | ||
| key === prop ? val = value : null; | ||
| return val; | ||
| } | ||
| }); | ||
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| // Returns a new array | ||
| return output; |
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Suggested change
| var output = _.map(arr, function (element) { | |
| // Iterates over objects in 'arr' | |
| for (var [key, value] of Object.entries(element)) { | |
| // Finds 'prop' and returns its value | |
| var val; | |
| key === prop ? val = value : null; | |
| return val; | |
| } | |
| }); | |
| // Returns a new array | |
| return output; | |
| return _.map(arr, function (element) { | |
| // Iterates over objects in 'arr' | |
| for (var [key, value] of Object.entries(element)) { | |
| // Finds 'prop' and returns its value | |
| var val; | |
| key === prop ? val = value : null; | |
| return val; | |
| } | |
| }); |
It is possible, and is not a bad coding practice at all, to just return a map like this directly.
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