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kata.js
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kata.js
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function span(arr, predicate) {
let a = [[], []];
for (let i = 0; i < arr.length; i++) {
if (!predicate(arr[i])) {
arr.slice(i).forEach(element => {
a[1].push(element);
});;
break;
} else {
a[0].push(arr[i]);
}
}
return a;
}
// Functions for use in tests
function isEven(x) {
return Math.abs(x) % 2 === 0;
}
function isOdd(x) {
return Math.abs(x) % 2 !== 0;
}
// Arrays for use in tests
var arr1 = [2, 4, 6, 1, 4, 8];
var arr2 = [1, 4, 5, 7, 6];
var arr3 = [13, 17, 19, 11, 21];
function tr() { return true; }
console.log(span(arr1, isEven)); // [[2,4,6],[1,4,8]]
console.log(span(arr2, isEven)); // [[], arr2]
console.log(span(arr3, isOdd)); // [arr3,[]]