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Function - every and some functions #195

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Function - every and some functions #195

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15 changes: 15 additions & 0 deletions collections/function/every-some-functions.md
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~~~ javascript
const arr = [ 2, 28, 9, 1, 15 ];
const arrBis = [ -5, 13, 26, 18, 12 ];

// Test function
const isPositive = (number) => number > 0;

// Test if every element of array match the isPositive function
arr.every(isPositive); // -> true
arrBis.every(isPositive); // -> false

// Test if some element of array match isPositive function
arr.some(isPositive); // -> true
arrBis.some(isPositive); // -> true
~~~