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flattenDeep([]) // => [] | |
flattenDeep([[1]]) // => [1] | |
flattenDeep([1,[[[2],22,[222]]],3, () => {}, { a: 4 }, [undefined, [null]], null, 'hi']) | |
// => [1, 2, 22, 222, 3, () => (), {a: 4}, undefined, null, null, 'hi'] |
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range(0, 20, 5) // => [0, 5, 10, 15] |
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function range(start, end, step) { | |
const results = []; | |
if (end === undefined) { | |
end = start; | |
start = 0; | |
} | |
if (step === undefined) { | |
step = (start < end) ? 1 : -1; |
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range(4) // => [0, 1, 2, 3] | |
range(-4) // => [0, -1, -2, -3] | |
range(1, 5) // => [1, 2, 3, 4] | |
range(0, 20, 5) // => [0, 5, 10, 15] | |
range(0, -4, -1) // => [0, -1, -2, -3] | |
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const pizzaSlices = ['pepperoni', 'pepperoni', 'olives', 'olives', 'plain', 'plain', 'bacon', 'bacon']; | |
chunk(pizzaSlices, 2); // => [['pepperoni', 'pepperoni'], ['olives', 'olives'], ['plain', 'plain'], ['bacon', 'bacon']]; | |
chunk(pizzaSlices, 3); // => [['pepperoni', 'pepperoni', 'olives'], ['olives', 'plain', 'plain'], ['bacon', 'bacon']]; |
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function sumBy(items, iteratee) { | |
const sumByFunc = getSumByFunc(iteratee); | |
let sum = 0; | |
items.forEach(item => { | |
sum += sumByFunc(item); | |
}); | |
return sum; | |
} |
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function sumBy(items, iteratee) { | |
const sumByFunc = getSumByFunc(iteratee); | |
return items.reduce((sum, item) => { | |
return sum + sumByFunc(item); | |
}, 0); | |
} |
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function sumBy(items, iteratee) { | |
const sumByFunc = getSumByFunc(iteratee); | |
// sum loop... | |
} |
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function sumBy(items, iteratee) { | |
const sumByFunc = getSumByFunc(iteratee); | |
let sum = 0; | |
for(let i = 0; i < items.length; i++) { | |
sum += sumByFunc(items[i]); | |
} | |
return sum; | |
} |
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function getSumByFunc(iteratee) { | |
if (iteratee === undefined || iteratee === null) return item => item; | |
if (typeof iteratee === 'string') return item => item[iteratee]; | |
return iteratee; | |
} |
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