2020-11-06.ts

// 沒限制
function g(a: number[], p: (x: number) => boolean) {
    let i;
    for (i = 0; i < a.length; ++i) {
        if (p(a[i])) return i; // early return
    }
    return i;
}

// 有限制
function h(a: number[], p: (x: number) => boolean) {
    let i;
    let n;
    for (n = a.length, i = n - 1; i > 0; --i) {
        if (p(a[i])) n = i;
    }
    return n;
}

const a: number[] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

function f(t: number): number {
    return Math.sqrt(Math.abs(t)) + 5 * Math.pow(t, 3);
}

console.log(g(a, (x: number) => f(x) > 400));
console.log(h(a, (x: number) => f(x) > 400));