Update sqaure_it.md
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### Square The Data
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Pass an array of integers you want to sqaure it
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Here using `.reduce()` the new object is accumulator and one by one values from array are passed and go through function.
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Use mapObject to return a object from array passed as an argument which gets sqaured as math operation
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```
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const arr = [1,2,3,4,5,6,7];
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arr.reduce(function(a,b){
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a[b] = b * b;
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return a;
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},{}) // {1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49}
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//
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callback accumulator currentValue currentIndex array return value
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first call 1 1 0 [0, 1, 2, 3, 4] 1
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second call 2 2 1 [0, 1, 2, 3, 4] 4
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third call 3 3 2 [0, 1, 2, 3, 4] 9
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...
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```js
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const squareIt = arr => mapObject(arr, a => a*a)
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squareIt([1,2,3]) // { 1: 1, 2: 4, 3: 9 }
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```
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