【Edabit 算法 ★☆☆☆☆☆】【返回数组第一个元素】 Return the First Element in an Array

【Edabit 算法 ★☆☆☆☆☆】【返回数组第一个元素】 Return the First Element in an Array

arrays language_fundamentals

Instructions

Create a function that takes an array containing only numbers and return the first element.

Examples

getFirstValue([1, 2, 3]) // 1
getFirstValue([80, 5, 100]) // 80
getFirstValue([-500, 0, 50]) // -500

Notes

• The first element in an array always has an index of 0.

Solutions

function getFirstValue(arr) {return arr[0]
}

Solutions

let Test = (function(){return {assertEquals:function(actual,expected){if(actual !== expected){let errorMsg = `actual is ${actual},${expected} is expected`;throw new Error(errorMsg);}}}
})();Test.assertEquals(getFirstValue([1, 2, 3]), 1)
Test.assertEquals(getFirstValue([80, 5, 100]), 80)
Test.assertEquals(getFirstValue([-500, 0, 50]), -500)
Test.assertEquals(getFirstValue([5, 2, 3]), 5)
Test.assertEquals(getFirstValue([75675, 5, 100]), 75675)
Test.assertEquals(getFirstValue([-52320, 0, 50]), -52320)